Adjustment Procedures
5–8 THS710A, THS720A, THS730A & THS720P Service Manual
Meter Adjustment
Three equipment setups, shown in Figure 5–3, are required to complete this
adjustment procedure. For each step in the procedure, the specific input signal
required by that step is described in the TekScope instrument display. Refer to
these diagrams as necessary during the procedure. Table 5–2 summarizes the
steps in the procedure and the signal requirement for each step.
Table 5–2: Summary of meter adjustment steps
Step Uses Equipment Setup Signal or Resistance Source Setting
1DC voltage setup +400.0 mV
2DC voltage setup 4.000 V
3DC voltage setup 40.00 V
4DC voltage setup 400.0 V
5DC voltage setup 850.0 V
6AC voltage setup 400.0 mVRMS, 500 Hz
7AC voltage setup 4.000 VRMS, 500 Hz
8AC voltage setup 40.00 VRMS, 500 Hz
9AC voltage setup 400.0 VRMS, 500 Hz
10 AC voltage setup 600.0 VRMS, 500 Hz
11 Resistance standard setup 100.0
12 Resistance standard setup 1.000 k
13 Resistance standard setup 10.00 k
14 Resistance standard setup 100.0 k
15 Resistance standard setup 1.000 M
16 Resistance standard setup 10.00 M
17 DC voltage setup1500.0 mV
18 DC voltage setup11.000 V
1In steps 17 and 18, the DC voltage source must be able to sink approximately 1 mA
supplied by the TekScope instrument. You must determine whether or not your DC
voltage source is capable of sinking current supplied by a device under test. If the
DC voltage source cannot sink current, you can connect a 470 , 18 W shunt
resistor across the output of the DC voltage source during steps 17 and 18 only. The
shunt resistor will accommodate the current supplied by the TekScope instrument.