ETS-Lindgren HI-1710 Microwave Measurement System (Archived) - Manual (Page 49)

Page — 44 HI n 1710 Manual
3. Measure, and adjust if necessary, the following
supply voltages:
-8 volts Test point A: -7.92 - -8.08 volts,
adjust potentiometer R26.
+4 volts Test point B: 3.96 - 4.04 volts,
adjust potentiometer R25.
4. After adjusting the supply voltages in step3, press
the SHIFT (ZERO) and RESET (RANGE INCREASE)
switches on the HI-1710 and the meter will go
through a self-test sequence. User adjustment and
repair is limited to the power supply components on
the main chassis.
5. Analog Offset and Output - Connect a suitable DC
voltmeter to the Analog Output receptacle on the
back panel of the unit. Press the SHIFT and RESET
switches on the front panel and allow the
instrument to perform its self-test program. Do not
re-zero the meter. With the self-test completed, it is
possible to remove the probe and insert the Probe
Shorting Plug (Holaday Industries P/N 660037) into
the preamp receptacle. Adjust
R27 on the main
circuit board for 0.000 indication on the HI-1710
digital display. Adjust
R28 for a zero reading at the
Analog Output receptacle.
6. Remove the Probe Shorting Plug and replace it with
the Voltage Adjustment Plug (Holaday Industries
P/N 660036). Connect the DC voltmeter between
the Voltage Adjustment Plug terminal and chassis
ground. Adjust the potentiometer on the plug for a
1.000 volt reading. Adjust
R25 on the HI-1710
main circuit board for a 5.00 reading on the
Archived 4/2/10