Fluke PM 6666 User manual

CONTENTS
SAFETY.....................................................................4
Introduction................................................................4
PRODUCT PRESENTATION ....................................5
INSTALLATION ..........................................................7
Unpacking..................................................................7
Voltage-range selection .............................................7
Grounding..................................................................8
Connecting external reference...................................8
Installing options........................................................8
Calibrating the MTCXO..............................................8
OPERATING INSTRUCTIONS ................................10
Using the Timer/counter...........................................10
Battery unit ..............................................................22
Error codes ..............................................................22
GPIB-INTERFACE OPERATION..............................23
Introduction..............................................................23
What can I do using the bus? ..................................23
Connecting the controller.........................................24
Giving the counter an address.................................24
Checking the communication...................................24
Two ways of programming .......................................25
Syntax......................................................................25
Selecting output separator.......................................26
How to select function..............................................26
Selecting Measuring-Time....................................... 27
Selecting Input settings ........................................... 27
Totalize Start/Stop ................................................... 27
Free-Run/Triggered.................................................. 28
Service Request...................................................... 28
Status byte............................................................... 29
Output mode............................................................ 29
Bus Learn................................................................ 31
Programming data out............................................. 31
What happens when I switch to local? .................... 32
Summary of bus commands.................................... 32
Programming Examples .......................................... 33
SPECIFICATIONS................................................... 37
Measuring functions ................................................ 37
Input specifications.................................................. 38
Auxiliary functions.................................................... 39
Definitions................................................................ 39
General information................................................. 40
Optional accessories............................................... 41
Ordering information ............................................... 42
APPENDIX .............................................................. 43
Checking the sensitivity of counters ........................ 44
INDEX...................................................................... 45
4822 872 20017
7/October 1996
CONTENTS Page: 1
PM 6666 - OPERATORS MANUAL

DECLARATION OF CONFORMITY
for
FLUKE
Timer / Counter
PM 6666
Fluke Industrial B.V.
Lelyweg 1
7602 EA Almelo
The Netherlands
Statement of Conformity
Based on test results using appropriate standards, the product is in conformity with
Electromagnetic Compatibility Directive 89/336/EEC
Low Voltage Directive 73/23/EEC
Sample tests
Standards used:
IEC 348 (1978)
Safety Requirements for Electronic Measuring Apparatus
EN 50081-1 (1992)
Electromagnetic Compatibility Generic Emission Standard:
EN55011
EN 50082-1 (1992)
Electromagnetic Compatibility Generic Immunity Standard:
IEC801-2, -3, -4
The tests have been performed in a typical configuration.
This Conformity is indicated by the symbol , i.e. “Conformité européenne”.
DMB70-08-95206
Page: 2 CONTENTS
PM 6666 - OPERATORS MANUAL

Guarantee Statement
This Fluke guarantee is in addition to all rights which the buyer may have against his supplier under the sales agreement be-
tween the buyer and the supplier and according to local legislation.
Fluke guarantees this product to be free from defects in material and workmanship under normal use and service for a pe-
riod of one (1) year from the date of shipment.This guarantee does not cover possible required re-calibration and/or stand-
ard maintenance actions.This guarantee extends only to the original end purchaser and does not apply to fuses, batteries or
to any product or part thereof that has been misused, altered, or has been subjected to abnormal conditions of operation and
handling.
Fluke-supplied software is guaranteed to be properly recorded on non-defective media.We will replace improperly recorded
media without charge for 90 days after shipment upon receipt of the software.Our software is not guaranteed to be error free.
Fluke’obligation under this guarantee is limited to have repaired or replace a product that is returned to an authorized Fluke
Service Center within the guarantee period, provided that Fluke determines that the product is defective and that the failure
has not been caused by misuse, alteration or abnormal operation.
Guarantee service for products installed by Fluke will be performed at the Buyer’s facility at no charge within Fluke’service
travel area;outside this area guarantee service will be performed at the Buyer’s facility only upon Fluke prior agreement and
the Buyer shall pay Fluke round trip travel expenses.
If a failure occurs, send the product, freight prepaid, to the Service Center designated by Fluke with a description of the diffi-
culty.At Fluke’option, repairs will be made or the product replaced. Fluke shall return the product, F.O.B.Repair Center, trans-
portation prepaid, unless the product is to be returned to another country, in which case the Buyer shall pay all shipping
charges, duties, and taxes.Fluke assume NO risk for damage in transit.
Disclaimer
The foregoing guarantee is exclusive and is in lieu of all other guarantees, expressed or implied, including but not limited to
any implied guarantee of merchantability, fitness, or adequacy for any particular purpose or use.We shall not be liable for
any direct, indirect, special incidental, or consequential damages, whether based on contract, tort, or otherwise.
CONTENTS Page: 3
PM 6666 - OPERATORS MANUAL

SAFETY
Introduction
Read this page carefully before you install and use the
PM 6666 Timer/Counter.
This Timer/Counter has been designed and tested in ac-
cordance with IEC publication 1010-1, and CSA 22.2
No.231, and has been supplied in a safe condition.The
user of this instrument must have the required knowledge
of PM 6666.This knowledge can be gained by thoroughly
studying this manual.
Safety Precautions
Use generally-accepted safety procedures, in addition to
the safety precautions stated in this manual, to ensure per-
sonal safety and safe operation of the Timer/Counter.
Caution & Warning Statements
You will find specific warning and caution statements,
where necessary throughout the manual.Do not carry out
repairs or adjustments to the Timer/Counter without read-
ing the Service Manual, which contains the relevant warn-
ings for such activities.
CAUTION: Indicates where incorrect operating pro-
cedures can cause damage to, or
destruction of, equipment or other property.
WARNING: Indicates a potential danger that re-
quires correct procedures or practices in
order to prevent personal injury.
Symbols
Indicates where the protective ground lead is
connected inside the instrument.Never un-
screw or loosen this screw.
?Signal Ground symbol. This symbol indicates
that the signal ground of the connectors are in-
ternally connected to the other connectors with
the same symbol, and to parts that are easily ac-
cessible for the user.
Warning: All the metallic BNC’s will carry the same
voltage. Applying signals with a common
potential of more than 30Vrms (42Vpk or
60Vdc) above ground potential will make
the instrument dangerous.
<Indicates that the operator should consult the
manual.
Such symbols are printed near the input connectors.This
symbol on the instrument should encourage the user to
use the correct procedure for common instrument ground,
and maximum input voltages, as described in the Installa-
tion Chapter, Specification, and Battety Unit description.
If in Doubt About Safety
Whenever you suspect that it is unsafe to use the instru-
ment, you must make it inoperative, clearly mark it to pre-
vent its further operation, and inform the Fluke servicing
department.
E.g.The instrument is likely to be unsafe if it is visibly
damaged.
Page: 4 SAFETY
PM 6666 - OPERATORS MANUAL

PRODUCT PRESENTATION
General
The PM 6666 is a compact, high resolution, reciprocal
Timer/Counter which performs many functions.A number
of options are available i.e. HF-input, GPIB-interface, high
stability oscillator and rechargeable battery for field use.
A rack-mount kit and a carrying case are also available as
accessories.
Rear View
S) Rear feet.
T) Screws for removing the cover.
U) External-reference-input, BNC connector.
V) Voltage-range selector.
W) Power-inlet socket.
X) GPIB interface-connector (optional).
Y) GPIB address-selector ( option).
MAINS TRANSFORMER
INCLUDED OPTIONS
PM9607
PM9605
PM9604
ADDRESS
10MHz 0.5-15Vrms
IEEE488 INTERFACE
EXT REF INPUT
PM9608B
TALKONLY
16
LR 39484
R
VOLTAGE
SELECTOR
OFF
8421
ON DC1, DT1
E2
SR1, RL1
SH1, AH1
FUNCTIONS:
SUPPORTED
T5, L4
THERMAL FUSE IN
ISMB-1
S T U V W T S
XY
Figure 1 Rear View.
PRODUCT PRESENTATION Page: 5
PM 6666 - OPERATORS MANUAL

Front View
A) Power switch.
B) Reset button, doubles as Local button if the
Timer/Counter is equipped with an GPIB interface.
Starts and stops counting if the TOT A MAN func-
tion is selected.
C) Measuring-time selector-button. *
D) Function-selector button. *
E) Display-hold button. Freezes the display.
F) COM B via A button connects the signal on input A
to input B. The Input-A attenuator and AC/DC
switch affect both inputs.
G) Input-C BNC-connector (optional).
H) Input-A BNC-connector.
I) Set value button, depress to set sensitivity (AC) or trig-
ger level (DC).
J) Auto level, starts automatic trigger level setting. If ‘Set
Value’ is selected, this button is used to increase
the value.
K) Read level, displays trigger levels. If ‘Set Value’ is de-
pressed, this button is used to decrease the value.
L) Input-B BNC-connector.
M) Trigger indicators.
N) Attenuator buttons.
O) Slope selection buttons.
P) DC or AC coupling selection buttons.
Q) Large LCD-display.
R) Tilting support.
*The selected function is indicated on the display. A short
press on the button moves the cursor one step to the right.
A long press makes the cursor scroll.
SET A SET B
35pF
1M
ATTx1
FREQ
STANDBY
ON
A
HOLD
DISPL
TOT A
COMMON
PERIOD TIMERATIO
A/B
START/STOP
TOTALIZE A
LOCAL
RESET
A A-B
FUNCTION
B
HOLD
DISPLAY B via A
TOT A TOT A VOLT A
MAX-MIN
B via A
COMMON
B MAN
LEVEL
READ
REF
EXT LEVEL AUTO
1M
35pF
ATTx1
MAX 30Vrms
DC - 160MHz
A
LEVEL
AUTO
MAX 30Vrms
READ
LEVEL
B
DC TRIGGER LEVEL
DC DC
x10
AC SENSITIVITY
AC
AC x10
SINGLE
TIME
MEAS
10s
MEASURING TIME
0.2s 1s
FREQ
C
MAX 12Vrms
70MHz -1.3GHz
50
OPTION C
PM6666
ABCDEFGIM J RH
L
K
M
I
QNOPON
Figure 2 Front View
Page: 6 PRODUCT PRESENTATION
PM 6666 - OPERATORS MANUAL

INSTALLATION
Unpacking
If the Timer/Counter is cold, leave it in the cardboard box
until it has reached normal room temperature.
–Lift the Timer/Counter out of the box.
–Remove the polystyrene supports.
–Unpack the Timer/Counter from the plastic bag.
–Reverse the procedure to pack.
Check List
Has the Timer/Counter been damaged in transport? If it
has, file a claim with the carrier immediately, and notify the
Fluke sales & service organization to make repair or re-
placement of the instrument easier.
–Check that the package contains the following items in
addition to the Timer/Counter:
–This Operators’ Manual
–A power cable with protective earth conductor
–A Battery unit if ordered *)
–An MTCXO oscillator if ordered *)
–A GPIB interface if ordered *)
–An HF-input if ordered *)
*) Labels on the rear panel indicate which options are
fitted in your Timer/Counter.
Voltage Range Selection
Set the Timer/Counter to the local line voltage before con-
necting it.As delivered the Timer/Counter may be set to
either 115 V or 230 V.The setting is indicated on the volt-
age range selector on the rear panel.
If the voltage range setting is incorrect, set the selector in
accordance with the local voltage before connecting the
power cable to the line.
PM 9604
INCLUDED OPTIONS
PM 9605
PM 9607
PM 9608B
Figure 3 Options Label on Rear
10MHz 0.5-15Vrms
EXT REF INPUT
VOLTAGE
SELECTOR
PM 9604
INCLUDED OPTIONS
PM 9605
PM 9607
PM 9608B
IEEE 488 INTERFACE TALK ONLY
ADDRESS
168421
ON
OFF
SUPPORTED
FUNCTIONS:
SH1,AH1
T5,L4
SR1,RL1
DC1,DT1
E2
THERMAL FUSE IN
MAINS TRANSFORMER
Figure 4 Location of Voltage Range Selector.
INSTALLATION Page: 7
PM 6666 - OPERATORS MANUAL

Grounding
The Timer/Counter is connected to ground via a sealed
three-core power cable, which must be plugged into a
socket outlet with a protective ground terminal.No other
grounding is permitted for this Timer/Counter.Extension
cables must always have a protective ground conductor.
WARNING:Never interrupt the protective grounding
intentionally. Any interruption of the protec-
tive ground connection inside or outside
the instrument, or disconnection of the pro-
tective ground terminal is likely to make the
instrument dangerous.
Connecting External
Reference
If you wish to use an external 10 MHz reference frequency
source, connect it via a BNC-cable to the EXT REF INPUT
on the rear panel of the Timer/Counter.
When the Timer/Counter starts measuring, it automatically
detects the external reference and begins to use it.The
EXT REF indicator on the display is switched on.
Installing Options
Introduction
The options ordered at the same time as the
Timer/Counter are normally factory-installed.Other op-
tions can be fitted when needed.
The options fit inside the Timer/Counter, but not all at the
same time:The HF-input, the high stability-oscillator and
either of the GPIB-interface or the Battery-unit can be in-
stalled in one and the same Timer/Counter.
Calibrating the MTCXO
The MTCXO Time-base can easily be recalibrated to any
10 MHz reference.To maintain the accuracy of the
MTCXO, use a reference with an accuracy of 3*10–8.
The PM 9691 oven-enclosed oscillator used in Fluke
counters version /.5.meet this requirement, if calibrated.
Preparations
If you remove the cover when counter has been switched
on, the temperature of the MTCXO will rapidly drop about
10°C.Since the MTCXO must have a stable temperature
when calibrated you must wait an hour between removing
the cover and calibrating.
If the counter has been switched off more than three
hours, you can calibreate it directly.
Removing the Cover
WARNING: When you remove the cover you will ex-
pose live parts and accessible terminals
which can be dangerous to life.
–Make sure that the power cable is disconnected.
WARNING: Although the power switch is in the off
position, the line voltage is present on the
printed circuit board.
–Loosen the two screws in the rear feet.
–Grip around the front panel and gently pull the
Timer/Counter out of the cover.
Loosen the two screws
using a Pozidrive No. 1 screwdriver
Figure 5 Loosen These Screws to Remove Cover.
Page: 8 INSTALLATION
PM 6666 - OPERATORS MANUAL

Calibration Procedure
–Remove the cover from the counter.
–Allow the MTCXO to adapt the new ambient tempera-
ture. (See ‘Preparations’.)
–Connect the 10 MHz reference to Input-A.
–Switch ON the counter.
–Adjust the sensitivity control so that the counter counts
properly.
–Hold down the CALIB-button, on the main printed-circuit
board in the counter, and press the Reset-button.
–Wait about 20 seconds, until the display shows
10.0000000 MHz. Now the oscillator is calibrated.
–Switch OFF the counter and disconnect the 10 MHz ref-
erence.
–Fit the cover.
CALIB-button
Figure 6 Location of the CALIB-Button.
INSTALLATION Page: 9
PM 6666 - OPERATORS MANUAL

OPERATING INSTRUCTIONS
Using the Timer/Counter
CONTROL OPERATING THE
CONTROL DISPLAY GPIB-CODE
POWER, a two-position
mechanical push-button.
Depressed = ON,
Released = OFF
No control
possible but D
gives the same
settings as
after power-ON.
A short depression of
the FUNCTION button
moves the cursor in the
lower edge of the
display one step to the
right. If the button is
held depressed, the
cursor will scroll to the
right until released.
When the cursor
reaches the rightmost
position it jumps back to
the leftmost position and
continues from there.
One code for
each function, -
see below:
Move function cursor
to FREQ A FREQ A (FREQ B
possible via
Bus)
ON
STAND-BY
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
FUNCTION
FUNCTION
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
Page: 10 OPERATING INSTRUCTIONS
PM 6666 - OPERATORS MANUAL

FUNCTION AND RANGE HINTS AND COMMENTS
Switches the power ON and OFF. When switched on, the
built in microprocessor switches on all segments of the dis-
play then it runs a power-up test, checking the measuring-
logic of the Timer/Counter before the counter starts work-
ing. This test takes about 2 seconds.
If an error is found, an error code will be displayed. Try
switching the Timer/Counter off and on again. If error code
01 - 03 persists, call Fluke service. Look on the last page in
this manual for Phone No. and address.
WARNING:The power switch operates on the secondary
side of the transformer. The power cable must be
disconnected from the line outlet socket if it is necessary to
completely isolate the Timer/Counter from the line.
Error 01 = RAM memory error
Error 02 = Measuring logic error
Error 03 = Internal bus error
Error OF = Overflow in the counting registers
Selects one of the nine measuring functions available. The cursor does not stop at FREQ C if no Input-C HF-input
is installed.
Reciprocal frequency measurement of the signal at Input-A.
Range:
0.1 Hz to 16 MHz (SINGLE measuring-time)
1 Hz to 160 MHz (0.2, 1, and 10 s measuring-time)
If the signal is sine shaped and the input AC coupled, the
minimum input frequency is 20 Hz (at specified sensitivity).
OPERATING INSTRUCTIONS Page: 11
PM 6666 - OPERATORS MANUAL

CONTROL OPERATING THE
CONTROL DISPLAY GPIB-CODE
Move function cursor to
FREQ C FREQ C
Move function cursor to
PER A PER A
Move function cursor to
RATIO A/B RATIO A,B (RATIO B,A
RATIO C/A and
RATIO C/B
also possible
via bus)
Move function cursor to
TIME A-B TIME A,B (TIME B,A also
possible via
bus)
Move function cursor to
TOT A B TOTG A,B
(TOTG B,A
also possible
via bus)
Move function cursor to
TOT A BTOTS A,B
(TOTS B,A
also possible
via bus)
Move function cursor to
TOT A MAN TOTM A (TOTM B also
possible via
Bus)
FUNCTION
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
FUNCTION
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
FUNCTION
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
FUNCTION
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
FUNCTION
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
FUNCTION
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
FUNCTION
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
Page: 12 OPERATING INSTRUCTIONS
PM 6666 - OPERATORS MANUAL

FUNCTION AND RANGE HINTS AND COMMENTS
Reciprocal frequency measurement of the signal at Input-C.
Range:
70 to 1300 MHz (PM 9608B)
The cursor does not stop at FREQ C if no Input-C HF-input
is installed.
When you select SINGLE, the Timer/Counter measures one
period, the range is: 100 ns to 200 000 000 s (about 6
years and four months!).
When you select 0.2, 1, and 10 s Measuring-time, the
Timer/Counter divides the input frequency by 10 and meas-
ures the average period for the No. of cycles in that time.
Range:
8nsto1s.
Use SINGLE when the input frequency is low. This
shortens the measuring time considerably since one cycle
is measured instead of 10.
The number of pulses at Input-A and the number of pulses
at Input-B are fed into one register each. When the set
Measuring-time has elapsed, register A is divided by regis-
ter B.
Range:
1*10–7 to 1.2*109
The signal with the lowest frequency must always be
connected to Input-B.
The Timer/Counter measures the time between a positive
slope on Input-A and a positive slope on Input-B (default).
Range:
100 ns to 2*108s (SINGLE)
0 ns to 20 s (average, the signal must be asynchronus
with the time base)
Use the SLOPE buttons if you wish to measure between
any other combination of slopes.
The Timer/Counter counts the total number of pulses fed to
Input-A. The positive slope of the Input-B signal starts the
totalizing, and the negative slope stops it. This is always a
SINGLE measurement.
Range:
0 to 1*1015 pulses.
kon the display indicates kilo-pulses (1000) and M
indicates Mega-pulses (1 000 000).
Use the Input-B SLOPE button if you wish to measure
during a negative pulse on Input-B
The Timer/Counter counts the total number of pulses fed to
Input-A. The positive slope of the first pulse on Input-B
starts the totalizing, and the positive slope of the next pulse
stops it. This is always a SINGLE measurement.
Range:
0 to 1*1015 pulses.
kon the display indicates kilo-pulses (1000) and M
indicates Mega-pulses (1 000 000).
Use the Input-B SLOPE button if you wish to measure
between two consecutive negative pulses on Input-B.
The Timer/Counter counts the total number of pulses fed to
Input-A. You start and stop the totalizing with the TOTAL-
IZE START/STOP button (RESET/LOCAL). If you keep this
button depressed for more than one second, the total sum
will be reset.
Range:
0to1*10
15 pulses
kon the display indicates kilo-pulses (1000) and M
indicates Mega-pulses(1 000 000).
The Measuring-time indicator is switched off in TOT A MAN.
OPERATING INSTRUCTIONS Page: 13
PM 6666 - OPERATORS MANUAL

CONTROL OPERATING THE
CONTROL DISPLAY GPIB-CODE
Move function cursor to
VOLT A MAX-MIN MAX VOLTAGE MIN VOLTAGE VMAX A, VMIN A
(VMAX B and
VMIN B
possible via
Bus)
MEAS TIME is operated
in the same way as the
functions control, see
page 8.
MTIME <num>
where <num>
is the time in
seconds.
Range:
10 ms to 10 s.
0 = Single
Move the measuring-
time cursor to SINGLE MTIME 0
Move the measuring-
time cursor to 0.2 s MTIME 0.2
Move the measuring-
time cursor to 1 s MTIME 1
Move the measuring -
time cursor to 10 s MTIME 10
FUNCTION
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
TIME
MEAS
TIME
MEAS
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
TIME
MEAS
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
TIME
MEAS
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
TIME
MEAS
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
Page: 14 OPERATING INSTRUCTIONS
PM 6666 - OPERATORS MANUAL

FUNCTION AND RANGE HINTS AND COMMENTS
The timer counter will measure the positive and negative
peak voltage an display them as voltage relative to 0 V.
Range: –51 V to +51 V.
The attenuator will switch in and out automatically when
needed during voltage measurements regardless if AUTO
LEVEL is selected or not.
The set Measuring-time controls the time during which the
main gate is opened, allowing pulses to enter the counting
logic. A longer Measuring-time gives higher resolution re-
adouts with more digits displayed.
The time the gate is open is not exactly the preset Measur-
ing-time, because the Timer/Counter synchronizes the
measurement with the input signal in order to measure com-
plete periods. If the period of the input signal is longer than
the set Measuring-time, the main gate does not close again
until the period is completed.
If you wish to do one measurement instead of repetitive
measurements, see DISPL HOLD.
When TOT A B or TOT A B is selected, the
Measuring-time setting will be used to set the display time.
For PER A and TIME A-B exactly one period or one time in-
terval is measured. The minimum result possible is 100 ns.
The display time will be 100 ms.
When set to SINGLE and FREQ A, the Measuring-time is
one cycle of the input signal or 3 ms, whichever is longest.
When set to SINGLE and FREQ C, the Measuring-time is
3 ms.
The input frequency is limited to 16 MHz for FREQ A and
PER A.
If external reference is used, the EXT REF indicator will not
be switched-on until after the first measurement.
A Frequency-A measurement will result in 6 to 7 digits on
the display.
A Frequency-A measurement will result in 7 to 8 digits on
the display.
A Frequency-A measurement will result in 8 to 9 digits on
the display.
OPERATING INSTRUCTIONS Page: 15
PM 6666 - OPERATORS MANUAL

CONTROL OPERATING THE
CONTROL DISPLAY GPIB-CODE
RESET/LOCAL, a short
press is enough for
Reset. When the remote
indicator is on, a press
will cause the counter to
switch back to LOCAL,
i.e. control from the front
panel.
TOTALIZE
START/STOP, one
press starts totalizing,
the next press stops.
Xstarts a new
measurement.
GATE OPEN
starts and
GATE CLOSE
stops Totalize
MAN.
Switches ‘on’ or ‘off’
DISPL HOLD when de-
pressed.
Not bus con-
trollable, but
Free-run OFF
will give a
similar function;
See GPIB-bus
operation.
Connect the signal to
INPUT-A via a BNC-
cable.
Connect the signal to
INPUT-B via a BNC-
cable.
LOCAL
RESET
START/STOP
TOTALIZE A
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
HOLD
DISPL
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
DC
160MHz
35pF
1M
MAX 30Vrms
A
B
35pF
1M
MAX 30Vrms
Page: 16 OPERATING INSTRUCTIONS
PM 6666 - OPERATORS MANUAL

FUNCTION AND RANGE HINTS AND COMMENTS
When reset is depressed, the display and counting registers
are cleared. When reset is released, a new measurement is
started. The Measuring-time-, Function- and display hold-
settings are not affected.
If the TOT A MAN function is selected, the RESET/LOCAL
button functions as a START/STOP button. One press
starts the counting and the next press stops it. A long de-
pression results in reset.
When the counter is controlled from the GPIB-Bus, the
LOCAL button can be disabled via the ‘Local Lock out’
command.
Display hold freezes the display, but not until the measure-
ment in process has been finished. A new measurement
can always be initiated via the RESET button.
Use this input for all functions except FREQ C.
Input data:
Range:
DC Hz to 160 MHz
Impedance:
1MΩ//35 pF.
Min. pulse duration:
4ns
At higher frequencies; use a 50Ωtermination type PM 9585
to avoid interference caused by impedance mismatch.
The illustration below shows which function block each of
the input controls affect.
This input is used for Ratio A/B, Time A-B and TOT A
start/stop (or gated) by B measurements.
Range: Identical to Input-A
Attenuator
Attenuator
DC/AC Switch DC+Trigger level AC+Sensitivity
Slope
U
U
Counting
logic
Slope
AC+Sensitivity
DC+Trigger level
DC/AC Switch
Input-A
Input-B
Level
Level
COM B via A
Figure 7 Input Circuit Block Diagram.
OPERATING INSTRUCTIONS Page: 17
PM 6666 - OPERATORS MANUAL

CONTROL OPERATING THE
CONTROL DISPLAY GPIB-CODE
One ATTx1/x10 push
button for each of input
A and B. Switch the
indicator ON to select
10 times attenuation and
OFF to switch off the
attenuator.
ATT ON
ATT OFF
You must first
select input
with INPA or
INPB.
One SLOPE push-
button for each of input
A and B. Switch the
indicator ON to select
negative slope, and OFF
to select positive slope.
TRGSLP POS
TRGSLP NEG
You must first
select input
with INPA or
INPB.
One DC/AC push-button
for each of input A and
B. Switch the indicator
ON to select AC and
OFF to select DC.
NOTE: Sensitivity can
be set when AC-coupled
and Trigger Level when
DC-coupled.
COUPL AC
COUPL DC
You must first
select input
with INPA or
INPB.
A depression switches
the AUTO LEVEL
indicator on or off.
AUTO ON
AUTO OFF
Depress the SET
VALUE button once and
the indicator in the
button switches on. Now
the auto level and Read
level buttons have the
red arrow up and down
function. Another press
will switch off the
function.
NOTE: Sensitivity can
be set when AC-coupled
and Trigger Level when
DC-coupled.
Separate
Codes for
trigger level
and sensitivity
SENS1 =20 mV
SENS2 =50 mV
SENS3 =100mV
TRGLVL
<num>
<num> = –5.1
to +5.1 V.
You must first
select input
with INPA or
INPB.
ATTx1
x10
DC
AC
AUTO
LEVEL
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
SET
A
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
Page: 18 OPERATING INSTRUCTIONS
PM 6666 - OPERATORS MANUAL

FUNCTION AND RANGE HINTS AND COMMENTS
When the indicator in the button is OFF, the signal is un-at-
tenuated; the trigger level range is –5 V to +5 V and the
sensitivity can be 0.02, 0.05 or 0.1 V.
When the indicator is ON the signal is attenuated 10 times;
the Trigger level range becomes –50 V to +50 V and the
sensitivity becomes be 0.2 V, 0.5 or 1.0 V.
If Auto Level or Volt is selected, the correct attenuator
setting will be selected automatically.
When the button indicator is ON, the active slope of the in-
put is changed from positive to negative.
Dual functions:
1) AC- or DC- coupled input.
2) Selection of variable sensitivity (AC) with 0 V trigger
level or selection of variable trigger level (DC) with maxi-
mum sensitivity.
NOTE: AC coupling together with Auto Level results in
maximum sensitivity and automatic trigger level setting.
You can remove any DC-component with AC-coupling.
For frequency, period, and ratio measurements: Select AC-
coupling and set the sensitivity so that the hysteresis band
of the Timer/Counter is about half the amplitude of the input
signal.
For time measurements: Select DC-coupling and set the
trigger level to the desired level.
The auto-level function always sets the DC trigger-level to
50% of the amplitude, it does also switch on the attenuators
when needed. Auto-level is selected simultaneously for both
A and B inputs.
The measuring rate is reduced to about two measurements/
second when using Auto-Level.
The sensitivity is decreased to 150 mVpp, and the minimum
frequency is 100Hz.
NOTE: Auto level gives automatic trigger level setting to AC
coupled inputs also .
Use Read-Level to check what trigger-levels Auto-Level has
selected.
For frequency, period, and ratio measurements:
Select AC-coupling and set the sensitivity so that the hyster-
esis band of the Timer/Counter is about half the amplitude
of the input signal.
For time measurements:
Select DC-coupling and set the trigger level to the desired
level.
If the sensitivity is too high, the Timer/Counter will be
triggered by noise and interference instead of by the signal.
OPERATING INSTRUCTIONS Page: 19
PM 6666 - OPERATORS MANUAL

CONTROL OPERATING THE
CONTROL DISPLAY GPIB-CODE
The READ LEVEL push-
button. When the
indicator is on, the
display shows the
trigger levels on the
display.
LEVEL A LEVEL B Use INPA? and
INPB? to read
input settings to
the controler
The COMMON B via A
push-button. When the
indicator is on the signal
on Input-A is also
connected to Input-B.
COM ON
COM OFF
Connect the signal to
INPUT-C via a BNC-
cable.
Connect an external
10 MHz frequency
source to the BNC-
connector on the rear
panel of the
Timer/Counter marked
EXT REF INPUT.
Not bus
controllable.
READ
LEVEL
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
COM
BviaA
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
C OPTION
70MHz - 1.3GHz
MAX 12Vrms
50
Ω
10MHz 0.5-15Vrms
EXT REF INPUT
HOLD
DISPLAYMEASURING TIME 10s1s0.2sSINGLE REF EXT
MAN
TOT A
B
TOT A
B
TOT A
A-B
TIME
A/B
RATIO
A
PERIOD
C
FREQ
A
FREQ
FUNCTION
COMMON
B via A
VOLT A
MAX-MIN
LEVEL
AUTO LEVEL READ
Page: 20 OPERATING INSTRUCTIONS
PM 6666 - OPERATORS MANUAL