85RF Fluke Electronics, 85RF Datasheet - Page 86

• 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

8062A
Instruction Manual
4-24
Voltage Test - DC (cont)
Voltage Test - AC
Resistance Test
High impedance dc readings
DC readings incorrect for
DC readings correct for
DC reading correct,
All ranges incorrect
All ranges incorrect
CR1 supplying proper current,
0.00, normal dc
readings correct
all ranges
200 mV, 2V incorrect
for 20V, 200V, 1000V
ac readings incorrect
but reading off
Test and Symptom
Table 4-6. Troubleshooting Guide (cont)
R1
Leakage from pcb, U3-6/7,
contamination
Input divider or input divider switches,
R2
Switches S3D, S3B
Check power supply connections
Ohms source voltage inadequate -
using a voltmeter in the 2V or 20V
range, measure ohms source voltage
between TP11 and common. Refer to
Table 4-7 for correct values.
Q3, Q4, RT1, R2, R1, Z5
CR1 not supplying enough current
(particularly if 200
Select diode test, connect an external
1 k resistor across the inputs and
measure the voltage drop across the
resistor - should be approximately 1V
( 10%).
Check values of the reference
resistors for the range not working.
Check voltage drops across the
known and unknown resistors and
make sure the ratio works properly.
Possible Cause/Suggestions
J13
J7
J12
Vss
Com
Vdd
range noisy).