Vertical Deflection; Variable Gain Control Range; Vertical Deflection; Input Coupling - Fluke Autoranging CombiScope PM3370B Reference Manual

PERFORMANCE TEST
Repeat the settings/procedure in table I for CH2, CH3 and CH4. Use table II for
PM3370B/80B/90B to test TRIG VIEW via input EXT TRIG. Select AC input
coupling to center the trace on the screen.
table II.
Input voltage Setting
(pp)
0.6V 0.1V
6V 1V
- Press the ANALOG key ('DIGITAL MODE' is displayed briefly), and repeat the
tests in this chapter for the digital mode.
- Press the ANALOG key ('ANALOG MODE' is displayed briefly) to return to
analog mode.
4.3.7

Vertical deflection; variable gain control range

(continuation of 4.3.6)
This test checks the vertical VARiable gain control.
Settings/procedure:
1 - Apply a square-wave signal of 0.2V to input CH1 and press AUTOSET.
2 - Set CH1 to 50 mV/div and input coupling to DC. Using the CH1 POS
control, center the waveform in the screen.
3 - Select the VARiable mode by simultaneously pressing both AMPL keys.
The readout changes into 50.0 mV/div.
4 - Press the mV key to adjust an input sensitivity of 40.0 mV/div.
Requirements:
1 - Verify that the displayed amplitude is between 4.86 and 5.14 divisions
(+/- 2.8%).
2 - Repeat the settings and procedure for CH2. For the PM3394B and
PM3384B repeat the same steps for CH3 and CH4.
4.3.8 Vertical deflection; input coupling (continuation of 4.3.7)
This test verifies the operation of the AC input coupling. Also, the operation of the
ground (GND) function is checked.
Requirements
analog mode
5.82...6.18 div (±3%)
5.82...6.18 div (±3%)
Requirements
digital mode
5.82...6.18 (±3%)
5.82...6.18 (±3%)
4 - 11