Impedance Test - Rigol DS1074B Service Manual

Chapter 3 Performance Test

Impedance Test

Specification:
Input Impedance
Analog Channel (CH1 to CH4) 1 MΩ: 0.98 MΩ to 1.02 MΩ
Test Procedures:
1. Impedance test of CH1 to CH4
1) Connect the active signal terminal of Fluke 9500B to CH1 of the oscilloscope,
as shown in Figure 3-8.
2) Configure the oscilloscope:
a) Press CH1 in the vertical control area (VERTICAL) at the front panel to
turn on CH1.
b) Rotate VERTICAL
mV/div.
3) Turn on Fluke 9500B; set its impedance to 1 MΩ and select the resistance
measurement function. Read and record the resistance measured.
4) Rotate VERTICAL
oscilloscope to 500 mV/div; read and record the resistance measured.
5) Turn off CH1. Repeat the steps above to test the impedances of CH2, CH3
and CH4 and record the measurement results.
2. Impedance test of the [EXT TRIG] channel
1) Disconnect the connections of the four input channels.
Connect the external trigger channel [EXT TRIG] with the active signal
2)
terminal of Fluke 9500B.
3) Turn on Fluke 9500B; set its impedance to 1 MΩ and select the resistance
measurement function. Read and record the resistance measured.
Test Record Form:
CH1 to CH4
Channel Vertical Scale
100 mV/div
CH1
500 mV/div
100 mV/div
CH2
500 mV/div
100 mV/div
CH3
500 mV/div
100 mV/div
CH4
500 mV/div
External Trigger Channel
Channel Input Impedance
EXT TRIG
DS1000B Sevice Guide
SCALE to adjust the vertical scale of CH1 of the
Test Result
Test Result
1 MΩ
SCALE to set the vertical scale of CH1 to 100
0.98 MΩ to 1.02 MΩ
0.98 MΩ to 1.02 MΩ
Limit Pass/Fail
Limit Pass/Fail
RIGOL
3-7