Tektronix 067-0599-00 User manual

Serial Number
067-0599-00 CALIBRATION FIXTURE
576 Calibration Unit
The 067-0599-00 Calibration Fixture was designed specifically for
calibrating and testing the performance of the 576 Curve Tracer.
Installed in place of the Standard Test Fixture plug-in, the
067-0599-00 provides accurate calibration voltages and currents for
the horizontal and vertical deflection circuits and accurate loads
for the collector supply and step generator circuits through the
external input and output lines at the test fixture interface.
External monitoring of the step generator output is available
through and EXTERNALMONITORBNCjack providing a
1
V/STEP (into
10,000 Mn) output).
The Vertical, Display Offset, Horizontal and Step Generator
switches of the 576 have matching switches on the 067-0599-00 for
easy, direct-reading, comparison-style adjusting and checking,
using the 576's own display.
The 067-0599-00 is totally dependent on the 576 for regulated
low voltage power supplies and AC line voltage.
062-1101-01
-------
471

Section 1
Section 2
Section 3
Section 4
Section 5
Section 6
Section 7
CONTENTS
Characteristics
Electrical
Environmental
Physical
Mechanical
Controls and Connectors
Operating Instructions
Circuit Description
Maintenance
General Information
. ..
Calibration
Schematic Diagrams
Electrical Parts List
Mechanical Parts List
Mechanical Parts List Illustrations

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SECTION1
CHARACTERISTICS
ELECTRICAL
Type 067-0599-00
Characteristics Performance Limits
Voltage Accuracies
CALIBRATORRANGEs 25 mV, 50 mV, 100 mV, 125 mV, 200 mV:
all within 0.04%
50 mVVARIABLE
Range At least -4% to at least +4%
HORIZONTALVOLTS
COLLECTOR Within 0.5%
BASE Within 0.5%
STEP GENERATOR Within 0.5%
Current Accuracies
VERTICAL
COLLECTOR Within 0.5%
EMITTER Within 0.5%
STEP GENERATOR Within 0.5%
Resistance Ratios
DISPLAYOFFSETMULTIPLIER Within 0.04%
COLLVOLTAGE
7 10 INTO 10 MD Within 0.8%
Resistive Loads
lK COLLECTORSHORT 1 kO within 0..5%
lK + 18 K 19 kO, within 5%
1-1

Characteristics--Type 067-0599-00
1-2
ELECTRICAL(cont)
Characteristics
Resistance Loads (cont)
.1 0
40 V LOAD
Camera Power
EXTERNALMONITOROutput
(With STEP GENERATORLOADS
Switch in EXT ONLYor STEP
GEN)
Performance Limits
0.1 0, within 3%
3.6
k.O,
within 5%
75
0,
within
1%
1 V/STEP (INTO 10,000 MO),
within 0.5%
POWERREQUIREMENTS
Characteristics
Characteristics
Temperature
Operating Range
Storage Range
Warm-up Time
Performance Requirements
Power derived through test fixture
interface of the 576.
ENVIRONMENTAL
Performance Requirements
Performance requirements listed
apply over the range of 20°C to 30°C
-40°C to +65°C
10 minutes at 25°C

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Characteristics
Construction
Chassis
Cabinet
Panel
Circuit Boards
Characteristics
Overall Dimensions
Main Unit
Height
Width
Depth
Plug-In Unit
Height
Width
Depth
Weight (Total)
Connectors
Main Unit Front
Plug-In Unit
Front Panel
Rear Panel
Panel
Characteristics--Type 067-0599-00
PHYSICAL
Information
Aluminum alloy
Aluminum alloy with blue-vinyl finish
Anodized aluminum alloy
Glass-epoxy
MECHANICAL
Information
9-1/2 inches
6-3/4 inches
10-1/2 inches
4 inches
8
inches
6-1/4 inches
~11 lbs ..
BNC
3-pin plug on coax
Amphenol-type
1-3

Characteristics--type 067-0599-00
1-4
FUNCTIONOF CONTROLSANDCONNECTORS
FUNCTION
Selects the function to be checked or calibrated.
HORIZAMP·CAL
Applies selected CALIBRATORRANGEvoltage to the 576 Horizontal
Amplifier External Input.
HORIZATTENCHECK
Applies output of the HORIZONTALVOLTSswitch to the Horizontal
Amplifier External Input.
VERTAMPCAL
Applies selected CALIBRATORRANGEvoltage to the 576 Vertical
.Amplifier External Input.
VERTCURRENTCHECK
Applies output of the VERTICALswitch to the Vertical .Amplifier
External Input.
VERTRISETIME CHECK
Applies a 0.5 V amplitude pulse to the 576's External Vertical
input and a 0.5 V, 200 µs sweep to the External Horizontal
input.
HORIZONTALRISETIME CHECK
Applies a 0.5 V pulse to the 576's External Horizontal input and
a 0.5 V, 200 µs sweep to the External Vertical Input.
HORIZ COMPENSATION
Applies a 25 V pulse to the Collector Sensing circuit in the 576.
STEP GE_N
Connects the STEP GENERATORswitch and STEP GENERATORLOADSswitch
to the- 576's base sensing, collector sensing and collector supply
circuits.
I I

Characteristics--Type 067-0599-00
CALIBRATORRANGE
Selects one of six voltages for Horizontal or Vertical Ampb.asic
gain calibration.
50 mVVARIABLE
Varies output of the 50 mV CALIBRATORRANGEposition only.
VERTICAL
Selects calibrated deflection factors in 20 steps from 10 A to 10 µA
Collector current or 10 µA to 10 nA Emitter current. Collector or
Emitter current output selected by setting of 576 MODEswitch.
DISPLAYOFFSETMULTIPLIER
Provides offset voltage in 20 calibrated steps to either the Hori-
zontal or Vertical Amplifier External inputs as selected by the
FUNCTIONswitch.
HORIZONTAL
BASEVOLTS
Selects six calibrated deflection factors from 20 V to 0.5 V.
COLLECTORVOLTS
Selects twelve calibrated deflection factors from two 1 k
(1000 V) positions to 0.5 V.
STEP GENERATOR
Selects six calibrated voltage deflection factors and twenty-one
calibrated current deflection factors.
STEP GENERATORLOADS
OFF
Grounds Base Sensing input to the 576 and opens the Calibration
Fixture's EXTERNALMONITORoutput circuit.
1
K
COLLECTORSHORT
Provides a
1 kO
load for the 576's Step Generator output circuit
and a ground to the Collector supply and sensing circuits.
1 K +18 K
Provides a 19
kO
load for the 576's Step Generator output circuit
and a 1
kO
load for the 576's base sensing circuit.
1-5

---- , __ --- ----
Characteristics--Type 067-0599-00
1-6
STEP GENERATORLOADS(cont)
EXT ONLY
Routes the 576 1s Step Generator output to the Calibration Fix-
ture Is EXTERNALMONITOR_ou·tput via its STEP GENERATORswitch.
The 576's base sensing circuit is grounded. The 067-0599-00
sees only external loads in this position.
STEP GEN
. 1 0
Routes the 576's Step Generator output to the Calibration Fix-
ture's EXTERNALMONITORoutput via its STEP GENERATORswitch,
loading the 576's base sensing circuit .
Provides a 0.1 0 load for the 576's Step Generator output for
checking short circuit current limiting.
40 V LOAD
Provides a 3.6 kO load for the 576's Step Generator output to
test maximum voltage output in the voltage mode.
COLLVOLTAGE+10 INTO 1 ill
Provides a 10 to 1 divider load for the 576's·Collector Supply
and grounds the base sensing circuit.
EXTERNALMONITOR,1 V/STEP (INTO 10,000 ill)
P819
BNCconnector providing output of the STEP GENERATORLOADSswitch for
external monitoring.
3-pin plug connected to 75 0 load for the 576's CAMERAPOWERoutput.
OPERATINGCONDITIONS
There are certain conditions that must be met before the performance limits
specified are valid.
The instrument must be calibrated at an ambient temperature between +20°C
and +30°C.
Unless otherwise noted, the instrument must be operating for at least 10
minutes within its environmental limits.
! I

Type 067-0599-00
General
SECTION2
OPERATINGINSTRUCTIONS
The 067-0599-00 Calibration Fixture was designed specifically for checking
or re-calibrating the performance of the Type 576 Curve Tracer. It pro-
vides accurate calibration voltages and currents for the Horizontal and
Vertical deflection circuits and accurate loads for the Collector Supply
and Step Generator circuits. The 067-0599-00 does this through the exter-
nal input and output lines at the 576 Test Fixture interface.
The VERTICAL, DISPLAYOFFSETMULTIPLIER, HORIZONTALand STEP GENERATOR
switches on the 067-0599-00 match the 576's switches with like names for
easy, direct-reading, comparison-style adjusting and checking, using the
576's own display for measurement. External monitoring of the 576's Step
Generator output is available through the 1 V/STEP (into 10,000 m) EXTER-
NALMONITORoutput jack.
Remove the Standard Test Fixture from the Type 576 and install the 067-0599-00
Calibration Fixture plug-in module. The 067-0599-00 is totally dependent
on the Type 576 for AC line voltage and regulated low voltage power supplies.
Turn the Type 576 on and allow at least 10 minutes warm-up before making
any checks or adjustments.
Because of the multiplicity and complexity of controls on the 576 and
067-0599-00 Calibration Fixture, checking apd/or adjusting the 576 should
be done sequentially according to the Performance Check/Calibration Pro-
cedure beginning on page 5-2 of the Type 576 Instruction Manual (Tektronix
Part Number 070-0905-00).
Performance Check Only
Beginning on page 5-4 of the 576 Manual, set all instrument controls accord-
ing to the listing. Plug the 3-pin connector from the 067-0599-00 into the
CAMERAPOWERjack of the 576 to provide a 75 0 load for the 576's +15 V
power supply. Begin performance checks with Step 5, page 5-8, doing only
those parts of each step labeled CHECKFOR - .
2-1

Operating Instructions--Type 067-0599-00
2-2
Adjustment Only
For a complete or partial adjustment of the 576's internal controls with-
out a complete performance check, start with Step 4 of the adjustment and
calibration procedure on page 5-6 of the 576 Manual. Connect the CAMERA
POWERjack on the 576. Do only those parts of each step labeled ADJUST-
and printed in red.
Calibration
To do a complete calibration of the 576, using the 067-0599-00, start the
procedure with Step 3, part f., on page 5-5 of the 576 Manual. Do each
step completely, combining adjustments and performance checks. Refer to
the INITIAL CONTROLSETTINGSlist on page 5-4 to be sure the 067-0599-00
controls are properly set up to start the calibration procedure.
Using the EXTERNALMONITOROutput
When checking or adjusting the 576's Step Generator output, always monitor
with a very high input impedance. The 067-0599-00 EXTERNALMONITORSTEP
GENand EXT ONLYoutputs are 1 V/STEP into at least 10,000 ill when the
STEP GENERATORswitch on the 067-0599-00 and the STEP GENERATORAMPLITUDE
on the 576 are in matching positions. Outputs from the rest of the STEP
GENERATORLOADSswitch are the results of the indicated loads to the 576's
circuits.
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Type 067-0599-00
SECTION3
CIRCUIT DESCRIPTIONS
Schematic
~
, Connectors to Indicator
Resistors Rl through R14 provide the maximum load the 576 power supplies
might encounter with Standard Test Fixtures. R13 and Rl4 simulate a
load that might be encountered if a camera were used on the 576.
Schematic <@)-, Function Switching
The DISPLAYOFFSETMULTIPLIER, Sl05, is a precision voltage divider from
an +11.7 V source. Rl02, 25
kf.l,
sets the voltage precisely at the top of
the divider. Rl05 consists of twenty 1
kf.l
resistors, matched to 0.2%.
Sl05 allows selection of 21 different voltage levels to check the display
offset in the 576. Sl07, CALIBRATORRANGE,selects precise voltages for
comparison with the calibrator voltages within the 576. Rl09, Rll2, R115,
and Rll8 allow fine adjustment of the 067-0599-00 calibrator voltages.
For the 50 mVCALIBRATORRANGEposition, a variable feature is provided,
with R121 being the variable pot in a divider string consisting of R120,
Rl21, and R122.
+1500 V from the Collector Supply in the 576 is applied through SlOO, the
FUNCTIONswitch, to a divider, producing a precise +1000 V. This +1000 V
supply is divided on Sl65, the HORIZONTALVOLTSswitch, into +10 V. This
+10 Vis compared to a +10 V reference, derived from the +11.7 Vin the
calibration fixture, and maintained through a regulator consisting of
Ql47 and integrated circuit Ul49. VR146 and VR147, tied from the collector
of Q147 to the 25 volt supply, provide over-voltage protection for Q147.
The current from the +1500 V supply passes through zener diodes VR138 and
VR145 to the collector of Ql47, through R148, and finally, is referenced
to the chassis through Ul49. The output voltage of Ul49 is maintained as
a constant depending upon the differential input voltage. This in turn
changes the current through the grounded base stage Q147 to maintain
+1000 Vat the top of the zener string. The +1000 Vis then divided
through the precision resistor string on S165, giving precise base and
collector voltage outputs for the Horizontal. The outputs are applied to
the base and collector sensing inputs of the 576.
The 576's Collector Supply voltage, AC coupled, is divided by 10 by the
resistor string R180 through Rl85, and routed to the EXTERNALMONITOR
connector on the front panel of the calibration fixture by the STEP GENERA-
TORLOADSswitch Sl85.
3-1

Circuit Descriptions--Type 067-0599-00
3-2
Schematic ~ , Step Generator Switch and Pulse Generator
The Steps In signal to S210, the STEP GENERATORswitch, is the Step
Generator output from the 576 via the STEP GENERATORLOADSswitch of the
067-0599-00. The purpose of this switch is to provide a current load
for the current steps and a voltage divider in the voltage step mode.
Integrated circuit U230 is part of an operational amplifier whose pur-
pose is to keep the voltage change of the Steps Out constant when the
voltage of the Steps In is changed.
Q234 drives the Step Polarity Invert relay in the 576. Q234 is turned·
on and off by contact 32 of the STEP GENERATORSWITCH, S210.
Q241 and Q251 make up a free-running multivibrator whose period is set
to 200 µs by R244. The output of the multi vibrator is applied through
R255 to the base of Q256 and amplified to produce a +25·V pulse. This
+25 V pulse is then divided by R258, R259, and R260 producing a +0.5 V
pulse. R259 allows exact adjustment of +0.5 V pulse amplitude. The
output of the multivibrator is also AC coupled via C262 to Q264 and Q268,
a ramp generator whose time constant is controlled by R268 and C270.
The ramp is output through source follower, Q271. R275 provides adjust-
ment to an exact +0.5 V sweep amplitude.
Schematic ¢,. , Vertical Switch
The 115 V AC line voltage is applied through the inter.,..connecting box
of the 067-0599-00 to the primary of T301, rectified, and filtered by
CR302, CR303; and C304. Q305 is a series regulator for the +25 V sup-
ply. Q308 and Q307 form a comparator circuit, using the +25 V regulated
supply.
VR310 provides a reference for the +11.7 V supply, from which a +10· V
supply is derived, adjustable by R311 and R312. An operational ampli...:
fier, formed by Q320, Q322, Q324, and U327, controls an error amplifier
formed by Q332, Q335, Q337, and Q340. From the emitter of Q340 an error
signal is fea' back to the gate of Q320 in the operational amplifier to
keep a constant +10 V across the resistors selected by the VERTICALswitch,
S360. Three voltages are developed from the +10 V supply through the re-
sistor divider string R314, R315, R316, and R317. These voltages, +6.25 V,
+2.5 V, and +l.25 V are applied to the VERTICALswitch and divided to pro-
vide accurate voltages for the 576's vertical sensing circuits.
Q347 and Q348 amplify the 300 ms pulses coming in from the 576.
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Type 067-0599-00
GENERALINFORMATION
Introduction
SECTION4
MAINTENANCE
This portion of the manual contains a complete calibration procedure for
the 067-0599-00 Calibration Fixture. The instrument will not often require
a complete, start-from-scratch calibration, but will need occasional adjust-
ments as components age or are replaced.
Calibration is a valuable part of preventive maintenance, since many types
of minor troubles may be discovered and corrected before they become serious
enough to disable the instrument. Also, certain troubles can be easily
isolated to a particular section of the instrument by attempting calibra-
tion.
This section includes a list of all instruments required to calibrate the
Type 067-0599-00 Calibration Fixture, a check out list, and a step-by-
step calibration procedure. The check out list is, essentially, a short
form calibration check; it has the same sequence of steps and the same
limits on checks or adjustments as the calibration procedure. This list
may be used to quickly check performance or locate faulty circuits.
·rt will be· assumed in this manual that appropriate interconnections and
necessary adapters are available.
It will also be assumed that a control will be left iri the position indi-
cated on the previous step unless otherwise indicated.
All front-panel control labels of the 067-0599-00 Calibration Fixture or
test instrument are in capital letters (STEP GEN), etc. Internal adjust-
ment labels are identified by an R or C number (R259, .5 V Pulse Cal).
4-1

Maintenance--Type 067-0599-00
Visual Inspection
The instrument should be visually inspected occasionally for such defects
as poor connections, broken or damaged parts, improperly seated transistors,
and heat damaged parts. The remedy for most of these defects is not obvi-
ous. A heat damaged part is usually the symptom of some defect that is
not obvious. The cause of overheating should be determined and corrected
before the part is replaced, otherwise the damage may be repeated.
Transistor Checks
Periodic preventive maintenance checks on the transistors are not recom-
mended: --Satisfa-ctory operation of
the
fostrument 1n all respects is adequate
assurance that the transistors are performing properly.
Recalibration
To insure that the 067-0599-00 Calibration Fixture maintains its accuracy,
check the calibration after each 500 hours of operation or every six months
if used intermittently. Complete calibration instructions appear later in
this section.
The calibration
the instrument.
apparent during
calibration.
Ordering Parts
procedure can also be helpful in isolating troubles in
Also, minor troubles in the instrument that may not be
normal operation may be revealed and corrected during
Many of the components are standard electronic parts that may be purchased
locally. However, all standard parts in the instrument can be obtained
from Tektronix through your local Tektronix Field Engineer or Field Office.
Before ordering, consult the parts list of this manual to determine the
value, tolerance, and rating required. Some of the .parts used are not
standard parts and may or may not be available for replacement. Consult
any particular replacement with your local Tektronix Field Engineer or
Field Office.

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Maintenance--Type 067-0599-00
CALIBRATION
Equipment Required:
TEKTRONIXInstruments
1 Type 547 Oscilloscope
1 Type 576 Curve Tracer
1 Type WPlug-In Unit High Gain Differential Comparator
1 GRW20MT3ALine Voltage Control Unit
Accessories
1 Probe, P6011, lX
1 50
0
BNCCoax Cable, 18 inches
Other Equipment
1 Potentiometeric Voltmeter Bridge (PVB) ESI Model 300
1 9 Mn Precision Resistor
CHECKOUTLIST
• 1.
Preset Calibration Fixture.
•
2. Check DISPLAYOFFSETMULTIPLIERResistance Ratio: Within
•
3.
Check Collector Voltage lOX Attenuation: Within 0.8%.
•
4. Check Emitter Current resistor accuracies:
•
5. Check Vertical Current resistor accuracies:
• 6. Check Step Generator resistor accuracies: -
D
7. Check Step Generator Loads:
a. 1 K: 1 kO, within 0.5%.
b. 1 K
+
18 K: 19 kO, within 5%.
c. 40 V LOAD: 3.6 kO, within 5%._
c .• 1 0: 0.1 0, within 3%.
Within 0.5%.
Within 0.5%.
Within 0.5%.
0.04%.
4-3

Maintenance--Type 067-0599-00
D
8. Check Power Supplies:
a. Presets
b. Setup
c. +25 V, within 3.5%.
d. +11.7 V, within 5%.
e. Preadjust +10 V.
D 9. Check 10 V Reference:
a. Setup
b. +10 V, within 0.04%.
D 10. Check Vertical Balance accuracy: Within 0.04%
D 11. Check Emitter Current Supplies:
a. Setup
b. +1.25 V, within 0.5%.
c. +2.5 V, within 0.5%.
d. +6.25 V, within 0.5%.
D 12. Check Calibrator Voltage:
a. Setup
b. +200 mV, within 0.04%.
c. +125 mV, within 0.04%.
d. +100 mV, within 0.04%.
e. +so
mV, within 0.04%.
f. +25 mV, within 0.04%.
•
13.
Check Horizontal Volts accuracies:
a. Setup
b. HORIZONTALCOLLECTORVOLTS, within 0.5%.
c. HORIZONTALBASEVOLTS, within 0.5%.
4-4
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Maintenance--Type 067-0599-00
D 14. Check Step Generator
a. Setup.
b. Amplifier Balance, within 2 mV.
c. Amplifier Gain, within 1%.
D 15. Check Pulse Duration and Amplitude
a. 0.5 V Sweep Time, 200 µs, within 3%.
b. 0.5 V Sweep Amplitude: 0.5 V, within 2%.
c. 0.5 V Pulse Amplitude: 0.5 V, within 2%.
d. 25 V Pulse Amplitude: 25 V, within
1 v.
4..5

Maintenance--Type 067-0599-00
CALIBRATIONPROCEDURE
1. PRESET CALFIXTURE
FUNCTION•
VERTICAL
CALIBRATORRANGE
DISPLAYOFFSETMULTIPLIER
HORIZONTALVOLTS
STEP GENERATORLOADS
STEP GENERATOR
2. DISPLAYOFFSETMULTIPLIER
VERTCURRENTCHECK
10 A
200 mV, CAL
10
1 K COLLECTOR
OFF
200
mA
a. Check resistance ratio within 0.04%.
Connect the PVB 300 to the CALFIXTURE: black(-) to term
J,
red (+) to gnd, and TAP to the 9-7-0 wire on wafer 6 (the point
between wafer 5
&
6 that are tied together) of the FUNCTIONswitch.
Set the PVB 300 for ratio measurement.
Ratio Measurement
1)
2)
3)
4)
Set FUNCTIONselector to RATIO position.
Set MULTIPLIERselector to .1 RATIO.
Set GENERATORswitch to OFF and DETECTOR
Set MAINDECADEdials to 0.0000. switch to OFF.
5) Turn POWERswitch to. ON position; allow 1 minute for stabilization.
6) · Set SENSITIVITY control to maximum gain (cw).
7) Connect the unknown resistive voltage divider to the UNKNOWN
terminals. If the measurement ratio is between O and 0.51,
connect the divider high (1. O) end to tf!rminals 3 and 4 and
8)
9)
low (O) end to terminals 1 and 2. (If the ratio is between
0.51 and 1.0 reverse the divider high and low end connections.)
The divider output terminal connects to the TAP terminal.
Set unknown divider to desired output setting.
Set the DETECTORswitch to INT and rotate the ZEROcontrol for
NULLDETECTORzero indication.
10) Turn detector SENSITIVITY control to minimum gain (ccw) and set
GENERATORswitch to INT.
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11) Increase MAINDECADEdial A (cw) until detector reverses '
1
4-6
polarity, then rotate one position in opposite direction (ccw).
12) Repeat step 11 for dials B through D incr~asing detector
sensitivity as needed.
13) Make final null balance using decade dial E.
14) The value of the unknown ratio is read from the MAINDECADE
dial setting (S) times the MULTIPLIERsetting (M). If the divider
high and low input leads were reversed because ratio was between
0.51 and 1.0, the ratio equals (10-S) times M.
15) Disconnect the unknown divider and turn the POWERswitch to OFF
before leaving the Model 300 PVB.
©

Maintenance--Type 067-0599-00
• 00@ @00 Qt
INT Off
"'
1 UT 1
...
o,o I EXT 1
m
Off INT
GENEU,TOI OEUCTOlt
..,
0 . .
..
0
J :
I
0 i
1
5
'I
I
NULL DETtCTOl
o,o
--
ZE•O
SfNSlllVITY
POWEii: MULTlPllER FUNCTION
141 •
III
171 ISI 161
Check each position of the DISPLAYOFFSETMULTIPLIERswitch as
indicated in the following table:
ERROR
DISPLAYOFFSET PVB 300 Minimum Maximum
9.5 .05 .04998 .05002
9 .1 .09996 .10004
8.5 .15 .14994 .15006
8 .2 .19992 .20008
7.5 .25 .24990 .25010
7 .3 .29988 .30012
6.5 .35 .34986 .35014
6 .4 .39984 .40016
5.5 .45 .44982 .45018
Reverse the PVB300 black (-) and red (+) leads.
5 .5 .49980 .50020
4.5 .45 .44982 .45018
4 .4 .39984 .40016
3.5 .35 .34986 .35014
3 .3 .29988 .30012
2 .2 .19992 .20008
1.5 .15 .14994 .15006
1 .1 .09996 .10004
.5 .05 .04998 .05002
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Maintenance--Type 067-0599-00
4-8
3. COLLECTORVOLTAGElOX ATTEN
a. Setup
Connect PVB 300: black(-) lead to gnd and red (+) lead to the
junction of the .01 capacitor and the 499k resistor on the rear
wafer of the STEP GENERATORLOADswitch. Connect TAP to the
junction of the two 1
Mf2
resistors on the second wafer of the
STEP GENERATORLOADswitch.
b. Check lOX attenuator within 0.8%.
Check resistance ratio as in Step 2. PVB 300: .1805 minimum,
.1835 maximum.
4. EMITTERCURRENTRESISTORS
a. Setup
Set the CAL FIXTURE VERTICALswitch to 50 mA.
Connect the PVB 300 red
(+)
lead to the 9-4 wire on the 4th wafer
of the VERTICALswitch. Connect the black(-) lead to the 5th
wafer at the junction of the 100 k resistor.
b. Check EMITTERresistors within 0.5%.
Set up the PVB 300 for a resistance measurement.
Resistance Measurement
1) Set FUNCTIONselector to R position.
2) Set MULTIPLIER selector to .1 OHMSposition.
3) Set GENERATORswitch to OFF and DETECTORswitch to OFF.
4) Set MAINDECADEdials to 4.XXXX.
5) Turn POWERswitch to ON position; allow one minute for
stabilization.
6) Set SENSITIVITY control to maximum gain (cw).
7) Connect test resistor to UNKNOWNterminals.
8) Set DETECTORswitch to INT and adjust NULLDETECTORfor zero
indication using ZERO control.
9) Turn detector SENSITIVITY control to minimum gain (ccw) and
set GENERATORswitch to INT position.
10) Rotate MULTIPLIERknob slowly clockwise, one position at a time,
until detector indication reverses polarity.
11) Reduce MAINDECADEdial A setting (ccw) until detector reverses
polarity, then rotate one position in opposite direction (cw).