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DVM 1.
2.
3.
4.
D.
6.
Switch DIGITAL READOUT SELECTOR to RF WATTS. Connect frequency counter to pin 8 of IC5. Set DVM Clock Cal (R923) for frequencyof 8000 Hz, t 20 Hz.
R64 24OO Hz
N O T E : All numbers on this board havea "900" prefix, i.e.,
I'T-l
\ll U
R923 is the same as R23.
Connect negative lead of external ungrounded adjustable DC power supply to DVM Reference (side of C904), and positive lead to DVM Input (side of C904).
R72 30% Mod
R50 1 0 0 0H z R58 \n 5 0 0H z
tn tU t l
R23 DVM
Monitoring the adjustable supply with a .LVoDYM such as the SencoreDVM38, set the output to approximately 1.4 VDC. Set DVM Cal (R913) for samereading on referencemeter and CB42 Digital Readout (igrroring decimal).
ffcloct'lG4,
R44 400H2
Il -c4 -b. fl nzs
U ffi". J-t
Reset external supply for about 25 mV, and set DVM Lin (R916) for same reading on reference meter and CB42 Digital Readout.
lu] fR 2
Power Cal
Repeat steps4 and 5 until both limits of the Digital Readout agree with the external meter.
vtt t l Lf
R13 DVM Cal t
Rl6 DVM LIN l
::
Fig. 63--Calibration points of function
T-l
til
R6TLI Power LIN
board.
AUDIO AND RF WATTS 1.
Set the DIGITAL READOUT SELECTOR to the AUDIO WATTSposition.
5.
Repeat Steps 3 and 4 until power function reads correctly at both calibrationpoints.
2.
Set SPEAKER LOAD switch to the SPEAKER position.
6.
3.
Feed 8 VRMS into the SPEAKER SUB jack. Adjust the PowerCal control (R902) for a reading of 1.00 Watts on the DIGITAL READOUT.
Feed 2.82 VRMS into the SPEAKER SUB jack. PressS/N CHECK button. DIGITAL READOUT shouldread 10.00 Watts(+ .5 Watts).
4.
Feed 3.00 Watts RF into the b0 Ohm input. Select RF POWER on the DIGITAL READOUT SEL_ PC_TOR..AdjustRF power Cal (R1002) through small hole in bottom of 50 Ohm Load shield for i power reading of 3.00 Watts.
Feed 2.82 VRMS into the SPEAKERSUBjack. Adjust Power Lin control (R906) for a reading of 1.00 Watts on the DIGITAL READOUT.
PERCENTMODULATION 1.
2.
Feed.500VRMS 1 KHz with a -L.4I4VDC offset betweenthe top and bottom feed-throughcapacitors on the 50 Ohm load shield.The top feedthrough is -1.414 VDC and the bottom feedthrough DVM reference.
3. 4.
Set DIGITAL READOUT SELECTORto POSITIVE MODULATIONposition. Adjust % MOD Cal (R929)for 50%readour. SetDIGITAL READOUTSELECTORto NEGATM MODULATIONposition.Readingehouldbe 50% + 2%.
RF.IF OUTPUT tion, and adjust IF Level control (R211) for 100K uV on RF Voltmeter.
1.
Connect RF voltmeter terminated in 50 Ohms to RF-IF OUTPUT.
2.
Set MICROVOLTS OUTPUT controls for 100K uV output.
5.
Rcpeat etepe3 and 4 until the same reading is ob. tained in both positions.
3.
With RF-IF FUNCTION Switch set to AM, adjust 27 MHz control (R2l2l for 100K uV on RF Voltmeter.
6.
Set the IF TLTNING control for maximum frequenry on the 6-12 MHz position of the RF-IF FUNCTION switch
4.
Set RF-IF FUNCTION switch to 6-12 MHz posi-
7.
Connect a 50 Ohm terminated frequencycounter to
50
2.
3.
4.
D.
6.
Switch DIGITAL READOUT SELECTOR to RF WATTS. Connect frequency counter to pin 8 of IC5. Set DVM Clock Cal (R923) for frequencyof 8000 Hz, t 20 Hz.
R64 24OO Hz
N O T E : All numbers on this board havea "900" prefix, i.e.,
I'T-l
\ll U
R923 is the same as R23.
Connect negative lead of external ungrounded adjustable DC power supply to DVM Reference (side of C904), and positive lead to DVM Input (side of C904).
R72 30% Mod
R50 1 0 0 0H z R58 \n 5 0 0H z
tn tU t l
R23 DVM
Monitoring the adjustable supply with a .LVoDYM such as the SencoreDVM38, set the output to approximately 1.4 VDC. Set DVM Cal (R913) for samereading on referencemeter and CB42 Digital Readout (igrroring decimal).
ffcloct'lG4,
R44 400H2
Il -c4 -b. fl nzs
U ffi". J-t
Reset external supply for about 25 mV, and set DVM Lin (R916) for same reading on reference meter and CB42 Digital Readout.
lu] fR 2
Power Cal
Repeat steps4 and 5 until both limits of the Digital Readout agree with the external meter.
vtt t l Lf
R13 DVM Cal t
Rl6 DVM LIN l
::
Fig. 63--Calibration points of function
T-l
til
R6TLI Power LIN
board.
AUDIO AND RF WATTS 1.
Set the DIGITAL READOUT SELECTOR to the AUDIO WATTSposition.
5.
Repeat Steps 3 and 4 until power function reads correctly at both calibrationpoints.
2.
Set SPEAKER LOAD switch to the SPEAKER position.
6.
3.
Feed 8 VRMS into the SPEAKER SUB jack. Adjust the PowerCal control (R902) for a reading of 1.00 Watts on the DIGITAL READOUT.
Feed 2.82 VRMS into the SPEAKER SUB jack. PressS/N CHECK button. DIGITAL READOUT shouldread 10.00 Watts(+ .5 Watts).
4.
Feed 3.00 Watts RF into the b0 Ohm input. Select RF POWER on the DIGITAL READOUT SEL_ PC_TOR..AdjustRF power Cal (R1002) through small hole in bottom of 50 Ohm Load shield for i power reading of 3.00 Watts.
Feed 2.82 VRMS into the SPEAKERSUBjack. Adjust Power Lin control (R906) for a reading of 1.00 Watts on the DIGITAL READOUT.
PERCENTMODULATION 1.
2.
Feed.500VRMS 1 KHz with a -L.4I4VDC offset betweenthe top and bottom feed-throughcapacitors on the 50 Ohm load shield.The top feedthrough is -1.414 VDC and the bottom feedthrough DVM reference.
3. 4.
Set DIGITAL READOUT SELECTORto POSITIVE MODULATIONposition. Adjust % MOD Cal (R929)for 50%readour. SetDIGITAL READOUTSELECTORto NEGATM MODULATIONposition.Readingehouldbe 50% + 2%.
RF.IF OUTPUT tion, and adjust IF Level control (R211) for 100K uV on RF Voltmeter.
1.
Connect RF voltmeter terminated in 50 Ohms to RF-IF OUTPUT.
2.
Set MICROVOLTS OUTPUT controls for 100K uV output.
5.
Rcpeat etepe3 and 4 until the same reading is ob. tained in both positions.
3.
With RF-IF FUNCTION Switch set to AM, adjust 27 MHz control (R2l2l for 100K uV on RF Voltmeter.
6.
Set the IF TLTNING control for maximum frequenry on the 6-12 MHz position of the RF-IF FUNCTION switch
4.
Set RF-IF FUNCTION switch to 6-12 MHz posi-
7.
Connect a 50 Ohm terminated frequencycounter to
50
