Racal Instruments 9916 Instruction manual

9916
UHF Frequency Meter
Workshop Manual
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14th February 2015

WORKSHOP
MANUAL
RAeAL
Fre~uency CQ~
Model
9916
For all your Technical Information and Spares contact
HESING TECHNOLOGY
CROMWELL CHAMBERS
8ST.
JOHN'S StREET
HUNTINGDON
CAMBS. PE18 6DD
Telephone: [phone]
Fax; [phone]

1<5 PONt N° 8/7-117
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UHF Frequency counter 9916

HA NDBOOK MA. EN DM ENTS
Amendments to this handbook (if any), which are on coloured paper for ease of
identifi cation, wi 11 be found at the rear of the book. The action ca 1I ed for by the
amendments should be carried out by hand as soon as possible.

'POZIDRIV' SCREWDRIVERS
Metric thread cross-head screws fitted to Racal equipment are of the ',Pozidri v'
type. Phillips typeand 'Pozidriv' type screwdrivers are not interchangeable,
and the use of the wrong screwdriver will cause damage.POZIDRIV is a
registered trade mark of G.K.N. Screws and Fasteners Limited. The'Pozidriv'
screwdrivers ore manufactured by Stanley Tools Limited.

CONTENTS Page
FRONTISPIECE
SECTION 1
TECHN lCA LSPECIFICATION AND
SUPPLEMENTARY DATA
SECTION 2DESCRIPTION, OPERATION
AND N\AINTENANCE
CHAPTER 1GENERAL
DESCRIPTION
1 -1
CHAPTER 2
OPERA TING INSTRUCTIONS
Power Supply 2-1
Frequency Measurement (Normal) 2-1
Frequency Measurement (Burst)
2-2
Frequency Measurement (LF Option)
2-2
Battery Economy Operation
2-2
Standby Operation
2-3
Battery Charging
2-3
Carrying Handle
2-3
Description of Controls
2-4
Indi cators
2-5
Rear Panel Items
2-6
CHAPTER 3PRINCIP
LES OF OPERATION
The
CDI Chip 3-1
Genera[Circuit Functions
3-2
Dynamic Display System
3-2
Control Information
3-4
Resistor Arrays
3-4
Control Sequence 3-4
9916 Vol.2
Contents (1)

CHAPTER 4
9916 Vol. 2
TECHN ICA LDESCRIPTION
Introduction
Logic Circuit Symbols
Normal Mode
Signal Input
IAI Channel Amplifier
AGe and Attenuator
Low Level Inhibit
Overload Protection clOd Indication
IB' Channel Ampl ifier
AGe and Attenudtor
low Level Inhibit
Signal Selection System
Frequency Standard
Oscillator Assembly 11-1254
Internal Standard Buffer
Externdl Standard Input
Display System
Resolution and Decimal Point Selection
Units Indicators
Overflow
Gate Indi cator
Display Blanking
Manual Res-et
Externa IHold and Reset
Burst Mode
Summary of Operation
Circuit Operation
Check Mode
Power Supply
Lirle Power
+5Vol t Stabil iser
- 5 Volt Stabilis-er
+ 24 Volt Supply
+2 Volt Supply
Battery Charging
Charge Irldicator
Battery Power
Battery Low Indicator
Over Discharge Protedion
. Overlood Protection
Standby Operation
Battery Economy Operation
LF Multiplier 11-1255
Principle
Circuit Description
4-1
4-1
4-1
4-1
4-1
4-1
4-2
4-2
4-2
4-3
4-3
4-3
4-4
4-4
4-4
4-4
4-4
4-5
4-6
4-6
4-6
4-6
4-7
4-7
4-7
4-7
4-7
4-8
4-8
4-8
4-9
4-9
4-10
4-10
4-10
4-11
4-11
4-12
4-12
4-12
4-12
4-\2
4-13
4-13
4-13
Contents (2)

CHAPT~R 5
Fig. No.
A.l
3.1
3.2
3.3
4 .1
4.2
4.3 .
5.1
991-6 Vol.2 .
..- .' '- .. _.. ~ (' '-.
tMlNTENANCE
Test Equipment Required
RemovaI of Covers
Transformer Voltage Selection
Fuses
Power Lead
AC Power Supplies Check
Resi stance Check
Supply Ran Voltages
Ripple Level
Battery Power Suppl ies Check
Charging Rate Checks
Battery Economy Check
Performance Tests and Ca I ibra ti on
Segment, Decimal Point and Sel f Check
Sensitivity and Burst Check, Channel 18 I
Sensitivity and Burst Check, Channel 'A I
Overload lndi cator Check
Frequency Standard Check
Infernal Frequency Standard Caf ibration
LF Multiplier
Dismonding and Reassembly
Remova I
of Display PCB
Removal of fvbin peB
Fitting Frequency Standard 9421 or 9442
Fitting Battery Pack 11-1289
Fitting LF Mul tipl ier 11-1255
IN TEXT I LLUSTRf\ T JON S
Data Sequence Diagram
Bosi c Frequency tv\eter
Multiplex Display
Interna( Control Sequence
-5 Volt Stabiliser
Battery Charging Circuit
Battery Power System
Voltage Selection Diagram ~
5-1
5-2
5-2
5-2
5-4
5-4
5-4
5-4
5-5
5-5
5-5
5-6
5-6
5-6
5-8
5-9
5-11
5- 11
5-12
5-13
5-14
5-14
5-14
5-15
5-16
5-17
Page
Tech .S pe c . (1 0)
3-1
3-3
3-4
4-9
4-10
4-11
5-3

" .. ".'1
LIST OF TABLES
Table No.
1
2
3
4
5
6
7
8
9
10
11
SECTION 3
Data Output Connector
Time Base Selection Code
Test Equipment Required
Power Supply Resistence Measurement
Segment and lAIChannel Decimal Point
Check
'8
1Channel Decimal Point and
Self Check
LF Decimal Point Check
rB
IChannel Sensitivity
lA IChannel Sensitivity
Internal Frequency Standard Calibration
LF Multipl ier Check
PARTS LI STS,tOMPONENT lAYOUTS AN D
CIRCUIT DIAGRAMS
C~~ponent Layout:· Display Assembly
Parts
List 1: Display Assembly
Page
Tech. Spec. (8)
T
ech. Spec. (9)
5-1
5-4
5-7
5-7
5-8
5-9
5-10
5-12
5-13
Fig.1
Circuit and Component Layout: Oscillator Assembly Fig. 2
Parts List 2: Oscillator Assembly
Parts List 3: Chassis, Front and Rear Panels
Parts
List 4a and 4b: Main PCB Assembly
Component Layout: Main
PCB Assembly
Overall Circuit: 9916
Fig.3
Figs.4and5
SECTION 4
Parts
List 5: LF MultiplierAssembly
Circuit and Component Layout: LF MulitiplierAssembly Fig.6
APPENDICES AN DCHANGE IN FORM:\ rlON
9916 Vol.2
OPTION 01: SERIAL TO PARALLEL INTERFACE
UNIT Appendix 1
Cori·tents (4)





SECTION1
TECHNICALSPECIFICATION

1. DISPLAY
Format:
Latch:
Display Time:
Reset:
Check:
Eight digit in-line, 7 segment l.e.d. display
plus overflow indicator. Decimal point positioned
automatically.
Previous measurement is displayed during the
period reguired to complete a new measurement.
The display is updated automatically at the end
of each measurement.
Approximately equal to gate time plus 1ms.
Apush
button Reset switch resets the reading to
zero when pressed and rel~ased.
With the Function switch in the CHECK position
the display shows:
Channel 'A' - Al I digits set to 8to check all
segments.
Channel I B'
operation.
Counter reads 1 MHz. to check
Gate/Charging
Indicator:
Bat.tery Low
Indicator:
Overload Indicator:
Overflow/ Standby
Indicator:
External Standard
Indicator:
Display Un its
Indicators:
9916 Vol. 2
lights when the gate is open or batteries are
being charged at the full rate.
Lights when batteries are low.
lights when 'A' channel input exceeds about
5V r.m.s.
lights when display is 'overfilled' or when on
Standb..,
mode.
lights when external frequency standard IS
connected and switched on.
"
Light to indicate the units in which the display
should be read.
Tech. Spec. or

2. INPUT IAI
Frequency Range:
S ens itivi ty:
40 MHz to 520 MHz.
Better than 10 mV.
..... -: ..
Signal Range:
Input Impedance:
Overload Protection:
Prescaling:
Automatic Gain
Control:
3. INPUT IB'
Frequency Range:
Sensitivity:
Automatic Gain
Control:
Input Impedance:
Maximum Signal, Levels:
Maximum Input Level:
4. FREQUENCY MEASUREMENT
Range:
Accuracy:
Gate Times:
10 nW to 5V r.m.s. with automatic gain control.
50.0 nominal.
Up to 35V r. m. s. maximum by p. i . n. diode
attenuator and reed relay.
I nput frequencies are prescal ed by a factor of ten.
50 dB minimum range. AGe output is available
at two pins on rear panel.
10Hz to 60 MHz.
Better than 10 mV.
Approximately 50 dB range.
1 MD in parallel with approximately 25 pF.
250V r.m.s. up to 10 kHz.
SOV r. m. s. up to 100 k Hz.
10V r.m.s. above 100 kHz.
The d.c. level + peak signal level must not exceed
400V over the full frequency range.
Channel "A I 40 MHz to 520 MHz (prescaled by 10).
Channel 'B' 10 H~ to 60 MHz (direct).
±1 count ± frequency standard accuracy.
0.91s, O.ls, 1.0s, 105.
9916 Vol. 2\
~Ch. Spec. (2)

FREQUENCY MEASUREMENT (Cont1d.)
Resolution:
Burst
Mode:
L.F. Multiplier Facility:
5. FREQUENCY STANDARD
Internal Frequency
Standard:
6. FREQUENCY STANDARD OUTPUT
Frequency:
Level:
Output Impedance:
Waveform:
7. EXTERNAL STA~IDARD INPUT
Frequency:
Minimum Signal Level:
MaximumSignal Level:
Maximum Input Level:
Input Impedance:
8. DATA OUTPUTS
Display, Function
and Control:
9916'Vol.2
Channel lA I: 1 kHz, 100 Hz, la Hz, 1 Hz.
Channel IB': 100 Hz, la Hz, 1 Hz, 0.1 Hz.
In the Burst Mode the gate remains closed unti I
triggered by incoming signal. After measurement
the display is held until manually reset. The
minimum signal durati<;ln is 40 ms plus gate time.
See Option 09.
Refer to Options OM, 048 and 04C on page
T ech. Spec. (5).
1 MHz.
Standard t. t.1. output giving approximately
600 mV peak to peak into 500.
Approximately 2000.
Rectangular.
1 MHz.
1 00 mV r. m.s .
10V r.m.s.
Thed.c. level + peak signal level must not
exceed 400V.
Approximately 200 ohms·(a.c. coupled).
Serial BCD output is provided at standard t. t.1 .
logic levels giving 8 digits and decimal point.
Static timebase and overflow outputs with riming
controls are provided.
Tech. Spec. (3)

9. POWER REQUIREMENTS
AC Supply:
Voltage Ranges (a.c.):
Consumption:
94V to 132V and 188V to 265'1/ r. m .S • ,
45 to 450 Hz.
Six pairs of ranges sel ected by transformer
connections and a link. A rear panel switch
selects between the upper and lower range of
each pair.
(1) 94-106V/106-119V
(2) 1 06- 119V/118-1 32V
(3) 188-212V/200-225V
(4) 200-225'1/ /212-238V
(5) 21 2-238V/224-251 V
(6)
224-251 V/235-265V
Refer to Chapter 5for setting instructions.
19 VA approximately.
10. ENVIRONMENTAL AND SAFETY SPEC IFICAT IONS
Operating Temperature;
Storage Temperature:
Humidity:
Mechanical:
Safety:
11 . MECHANICAL
o0 0 o.
-40 Cto +70 C (0 Cto +60 C Wl th Battery
Option) .
95% r. h. at +400C
In accordance with IEC 68.
Meets 1 EC 348 (BS 4743)
Dimensions:
Height:
Width:
Depth:
1~0 mm
284 mm
268 mm
Weight:
9916 Vol. 2
Approx i mate Iy 2.7 Kg exd ud ing Battery Pock.
Battery Pack 1 .5 Kg.
T ech. Spec. (4)

12. OPTION 01 SERIAL TO PARALLEL INTERFACE
Purpose: This
unit provides an interface between the 28-way data output of the
9916 and a 50-way connector to a printer, or remote display. It converts the
serial b.c.d. data to parallel format and transfers the following information:
8 decades of data in 4 line BCD weighted 1248, 3 line decimal point position,
print command, print hold, reset, overflow and time-base information. All logic
levels are t. t.l. comfXltible.
13. OPTION 04\: FREQUENCY STANDARD 9442
Type:
Frequency:
Ageing Rate:
Warm-up Time:
Tempenture Stability:
Afast warm-up ovened oscillator suitable
for the majority of applications.
14. OPTION 048 FREQUENCY STANDARD 9421
Type:
Ageing Rate:
Warm-up Ti me:
Temperature Stabi Iity:
9916 Vol.2
An ovened osci Ilator of the utmost precision
for use when the highest long term accuracy
is essential.
Initial: ±2 parts in 109 per day averaged
over aminimum of 10 days at
shipment.
10/ .
Long Term: ±5
parts in 10 day averaged
over aminimum of 10 days after
3months con,tinuous operation.
Better tran ±1 part in 107 within 20 minutes.
Better than ±6 parts in 10
10
ger °c averaged
over the range -lOoC to +45 C, but operable
°
to +55 C.
T ech. Spec. (5)

15. OPTION 04C: FREQUENCY STANDARD 11-1254
Type:
FreCJuency:
Ageing Rate:
Temperature:
An unovened crystal oscillator suitable for
non-critical appli cations or where the
instrument will nor~ally be used with the
customer's external standard.
5 MHz.
6 '
±1 part in 10 per month three months
after delivery, but less than ±1 part in
10
5
in the first year.
±8 parts in 10
6
over temperature range OOC
o
to +55 C. 6
±3 garts in 10 over temperature range
+20 C to +40
o
C.
16 . BATTERY POWER PACK OPT] ON: PART No. 11-1289
Mechani ca I:
Selection:
Battery Life:
Battery Condition:
Charge Ti me:
Standby Foci Iity:
9916 Vol. 2
Battery Pack is mounted on a metal tray
inside the instrument and connected via a
polarised 4 pin connector.
By means of 3 position LI~IE POWER/CHARGE/
BATTERY POWER switch on rear panel.
4~ hours minimum continuous at +20oC.
15 hours minimum on standby at +20
o
C.
Indi cated by 'Battery Low' lamp on front
panel.
o
14 hours at +20 C.
With STANDBY selected, only the internal
standard is operational. Pressing the Reset
button activates the counter for approximately
1 minute after which it reverts to the standby
d
o' t;
con Itlon.
Tech. Spec. (6)

17. OPTION 09 FREQUENCY MULTIPLIER
Function:
Frequency R mge:
Multiplication:
Resolution:
18. OPTIONALACCESSORIES
Accessories avai lable:
9916 Vol. 2
To increase measurement resolution at low
frequencies on IB' input channel.
10Hzto25kHz.
x100
As selected by Resolution switch.
Rigid carrying case (15-0450)
Padded carrying case (15-0444)
19 inch rack mounting kit (11-1126)
Data output connector (23-5147)
Tech .Spec (7), ...

DATA OUTPUT CONNECTIONS
Al. Data and Command information is available via a 28-way edge connector accessible
by removing a cover on the rear panel. The facil ities and pin connections are listed
in Table 1.
TABLE 1
Data Output Connector
-
Pin
Faci I ity
Pin
Facil ity
1
-5'1 nominal
A OV
2
+5V nominal
B
Overflow
\3
Key Way C Key Way
I--
44(BCD) 01(BCD)
-
"2
58
(BCD)
E
(BCD)
6
External
Hold Input
F
10kHz Sync.
I7
External
Reset Input
H Main Gate
18
Not Used J Not Used
I9-)K-)Time Base
cz
1-
Logic 11'
-)
10
b)Ly Information
I
I 11
-)M-)
(See Table 2)
a x
I
--
12 R(0) N
Not Used
,
,.13
Hold/Reset
P
Not Used
,.
,4
Prescale R Not Used
NOTES 1:
All facil ities are outputs except pins 6 and 7_
2: The Overflow level on pin Bis 0 sta.tic indication.
t;
3: The Prescale information on pin 14 is a permanent '1' level to indicate
that no correction is requ.ired extern~lly to the outputs as the decimal
point informat ion is automatically corrected on change of function
and channel.
9916 Vol. 2 Tech. Spec. (8)

TIME BASE CONTROL LOGIC
,
A2. The function and time base requirements are applied internally to the COl chip on
six-lines. The inverse states of this code are fed out to the rear Data Output
connector. As the 9916 is a single function instrument the -Z;, b, ~ 'function' lines are held
permanently at logic '1'. The time base information code is g.iven in Table 2.
TABLE 2
Time Base Sel ection Code
Code Gate Time Resolution
---
Channel A
Channel
B
xyz
~4s g1
lCo>
01 1
lams
1 kHz 100 Hz
10 1
100 ms
100 Hz
la Hz
00 1 1s
10Hz 1Hz
11 0
10s
1Hz
0.1 Hz
DATA OUTPUT FORMAT
A3. The b.c.d. outp,_'t data is available at the 28-way edge connector in a bit
parallel,byte serial form. The data is sequenced by a la kHz synchronising signal.
The data presentation is delayed 0.5}Js from the negative edge of the synchronising signal.
An additional synchronising pulse R(o) determines the first state (lOo digit). Figure Al
(not drawn to scale) shows the timing sequence for the ten states.
A4. The ten data output states are as follows:-
States
1 to 8
9
10
9916 Vol. 2 .
Facil ity
Digit (display) i3 formation. 7
Overflow for 10 ,104;106 and la digits on
pins D, Er 4 and 5 respectively.
Decimal point position in kHz units, plus overflow
informati.on for 10
5
digit (relative to directly gated
input) via pin 5.
T ech. Spec. (9)

10 KHz SYNC.
. {PIN FI
RIOI r PIN 12 I
OUTPUT STAlES
DATA OUTPUTS
··SLJ1J1J
I
lIT
10
10
7
9916 Vol. 2
\.----------~v----------~/ '----v--"~
DIGiT DATA OVER OVERFLOW
FLOW AN~ d.;".
Data Sequence Diagram Fig A.1
Tech. Spec. (10)