85RF Fluke Electronics, 85RF Datasheet - Page 87

• Manufacturer Part Number: 85RF
• Description: PROBE HIGH FREQ 500MHZ
• Manufacturer: Fluke Electronics
• Type: High Frequencyr

Specifications of 85RF

• Impedance: 10M Ohm
• Voltage - Max: 30VRMS, 200VDC
• Lead Free Status / RoHS Status: Lead free by exemption / RoHS compliant by exemption
• Ratings: -
• Current Rating: -
• Color: -
• Termination: -
• Wire Insulation Material: -
• Cable Length: -
• Other names: 532457

Resistance Test (cont)
Current Test
Continuity Test
Diode Test
BT Indicator
Low range readings correct,
Constant reading of 0.00
Fuses F1 and F2 good, but
High crest-factor ac current
No response
No tone
No readings or very low
readings
BT indicator not displayed
high range readings off
current readings off
readings off
when battery voltage is
less that 5.6V
Test and Symptom
Table 4-6. Troubleshooting Guide (cont)
Check fuses F1 and F2 with fuse
Select switch decoding self-test
Q3 and Q4 leak-check by seeing if
M reads OL with open input. Main
pcb contaminated - clean carefully
and check performance.
check procedure in Chapter 2-4.
Switches and resistors in current
shunt.
U1
check for proper function decoding
and also confirm that the continuity
comparator responds. R31, S1A
Q6, R4, LS1. Check U3-1 (tone
output) with scope for 2.667 kHz
signal.
CR1 (diode test source). To check
CR1, select diode test, connect an
external 1 k resistor across the
inputs and measure the voltage
across the resistor
approximately 1V ( 10%).
U3, Z4-U3 compares voltage at pin
18 (BT1) with voltage at pin 10
(COM-analog common voltage). BT
turns on if U3-18 voltage is greater
than common. turns off if it is less
( 50 mV)
Possible Cause/Suggestions
Troubleshooting
Maintenance
should be
4-25
4