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To prevent Probe damage, the dc component of
the input signal (includes transients) must not be
more than 200 V dc. Maximum Probe input is
30 V ac rms and 200 V dc. Measurements of an ac
signal riding a dc voltage can be made up to 200 V
dc. The input capacitor charges to the peak value
of ac plus dc. If the dc level is then changed by
more than 200 V dc, the transient can possibly
damage the Probe. The chance of damage can
prevented if the input capacitor is discharged at
the end of each measurement. Momentarily touch
Probe tip to the ground clip to discharge the
capacitor.
Performance Test/Calibration
The performance and calibration test is a verification test to
make sure that the 85 RF II is functional and correctly
calibrated. Use the procedure as an acceptance test and/or
calibration procedure (the Probe has one adjustment which
is R2). The recommended calibration interval is one year.
If the Probe cannot be calibrated to the specifications in this
document, the Probe could be damaged and require
replacement or repair. Contact Fluke for instructions.
1. Configure the equipment as shown in Figure 2. Use the
leveled sine function of the scope output to set the AC
Calibrator signal generator for 1 V rms at 25 MHz and the
DMM to measure 1 V dc.
C1
E2
220P
AGND
MP1
STANDOFF CLIP
WCaution
CR2
BAT41ZFILM
CR1
BAT41ZFILM
E1
Figure 1. Schematic Diagram
Note
R1
1.82M
C2
330P
WP2
CW
R2
500K
R3
1.3M
CR3
1N4448W
WP1
gsk001.eps
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