Tektronix DM 5010, Инструкция по эксплуатации

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Maintenance— DM 5010
Table 7-3 (cont)
Typical Symptoms
Circuit Section—Verification
Dead, unchanging, or flickering display, or
no response to pushbuttons.
CPU Board, Diagram 9
3. FRONT PANEL—Check that U1605-1 (RW3) is a logic 1. With the DIODE
TEST button held in, check the same point for a 0.6 ms logic 0 pulse at '5 ms
intervals.
Error code 311
Isolation Board, Diagram 4
4. ISOLATED SUPPLIES —Using an isolated ground reference, check the fol­
lowing supply voltages:
P1701-7A +35.1 Vdc, ±11%
P1701-13B +36.9 Vdc, ±11%
P1701-13A -36.9 Vdc, ±11%
P1701-14A —17.6Vdc, ±11%
P1701-14B +17.6 Vdc, ±11%
P1701-15B -17.6 Vdc, ±11%
P1701-15A -27 Vdc, ±2%
No response to REAR INPUT button,
wrong reading, hunts for range, displayed
measurement drifts.
Isolation Board, Diagram 5
ADC Board, Diagram 2
RMS Board, Diagram 3
5. FUNCTION & RANGE REGISTERS—Repeatedly press the REAR INPUT
button and check that the relay clicks with each button press.
Error code 311, wrong reading, hunts for
range.
Isolation Board, Diagrams 4 and 5
ADC Board, Diagram 1
6. A/D CONVERTER—Connect U1 120-3 on the ADC Board to analog ground.
Display reads —zero in all DCV ranges.
One or more DCV readings is out of
specification or 311 error code.
De
Voltage Measuring Circuits, Diagram 1
7. Apply 0 V de and 95% of the full scale de voltage at the DM 5010 inputs for
each DCV range. All readings are within specification.
One or more ACV or ACV + DCV readings
is out of specification.
RMS Board, Diagram 3
8. RMS CONVERTER—For both ACV and ACV + DCV, apply a 200 Hz, 5% and
95% of full scale input at the DM 5010 inputs, for the 200 mV through 200 V
ranges. Apply a 200 Hz, 14% and 95% of full scale input for the 700 V range. All
readings are within specification.
One or more OHMS readings is out of
specification.
RMS Board, Diagram 3
9. OHMS CONVERTER—Apply 0 Ω and 95% of the full scale input resistance,
at the DM 5010 inputs, for each OHMS range. All readings are within
specification.
7-10
ADD JAN 1982