TB 9-6625-2050-24
(6) Set range calibrator FUNCTION switch to CALIBRATE and verify that TI
autoranges to 1 mW range.
(7) Adjust TI CAL ADJ control to obtain a 1.000 indication on digital readout.
(8) Set CAL FACTOR % switch to positions listed in table 9.
TI will indicate
within limits specified.
b. Adjustments. No adjustments can be made.
14. Reference Oscillator Frequency Accuracy (Models 436A and 436AOPT9/22)
a. Performance Check
(1) Press TI LINE pushbutton to ON and POWER REF pushbutton to OFF.
(2) Connect TI POWER REF OUTPUT connector to frequency counter and adjust
counter to measure frequency of 50.0 MHz.
(3) Set TI POWER REF pushbutton ON and observe indication on the counter. If
frequency counter does not indicate between 49.5 and 50.5 MHz, perform b below.
b. Adjustments
(1) Remove power meter top cover.
NOTE
Take care not to ground +15 V or -15 V inputs to power
reference oscillator when performing b (2) through (6).
Grounding either of these inputs could damage power reference
oscillator and/or power supply.
(2) Grasp power reference oscillator assembly firmly, and remove four screws which
secure it to power meter chassis.
(3) Tilt power reference oscillator assembly to gain access to circuit board
underneath metal cover, and adjust A8L1 (FREQ ADJ) (fig. 5) to obtain a 50.00 MHz
indication on counter (R).
(4) Reposition power reference oscillator on power meter chassis but do not replace
mounting screws.
(5) Observe indication on the counter. If it is 50.0 MHz, the adjustment procedure
is complete. If it is not within these limits, repeat b (3) except offset power reference
oscillator frequency as required to obtain a 50.0 MHz indication on counter when power
reference oscillator assembly is repositioned on power meter chassis.
