HP 8112A, Operating, Programming And Servicing Manual

Page: 168 / 406

HP 8112A
12. Make a note of the adjusted voltage.
13. Set the DVM to read DC voltages. If the DVM does not have
a built-in filter, use an external low pass filter, as shown in
Figure 9-6.
Voltmeter (HP 3458A)
_L_q_� __ f'�_§§ __ _F._i __ l_j;_f?_f: __
:
I i 20K
:
50
Ohm
feedthrough
I
J2.c2uFi
Note
9-16 Adjustment Procedures
·····--- - - · · · · · · · · · - - ----........ ---
Figure 9-6. Low Pass Filter
14. Switch COMPL on and off, and adjust A1R403 to obtain the
minimum amplitude difference between the two modes (Same
DVM reading as step 1 1 ) .
15. Adjust A1R425 for 0 V ±10 mV.
If the adjustments are not possible, change value of A1R437 (see
table 9-1 ) and repeat steps 1 to 15.
16. Set the HP 8 1 12A as follows:
HIL
101
+0.5 v
-0.5 v
1 7. Set up the DVM to read AC voltages up to 10 V. Switch filter
OFF or remove external filter.
18. Adjust A2R46 for 0.506 V ±5 mV RMS .
19. Use the DVM built-in filter and set the DVM to read DC
voltages. If the DVM does not have a built-in filter, use an
external low pass filter, as shown in Figure 9-6.
20. Adjust A1R416 for 0 V ±5 mV.
Linear Amplitude
2 1 . Set up the HP 8 1 12A as follows:
Transition
HIL
101
Linear
+4.99
v
-4.99 v
22. Switch COMPL on and off, and adjust A1R407 to obtain
the minimum amplitude difference between the two modes
0 V ± 10 m V (Same DVM reading) .
23. Set up the DVM t o read A C voltages up t o 10 V. Switch filter
OFF or remove external filter.