Table of Contents
Advertisement
Lf Reject
Operating the Probe
Coupling functions
Coupling functions
There are three methods for blocking or compensating for the dc component of a signal.
Each has specific advantages.
Probe system coupling functions
dc Offset
dc Blocked
Probe alone
±18 V
Probe with 10:1
±180 V
Probe with 100:
±500 V
Set-up needed
Adjust offset to put
signal on screen
1
Remote Control?
Yes
CMRR
No
degradation?
Low-frequency
No
degradation?
1
Isolated external dc reference and control signals are needed.
Lf reject is the best method of eliminating the dc component of a signal when dc is not
a factor in the measurement. Remove the ac adapter if it is installed. The key
characteristics are:
• The low frequency component (from dc to the selected corner frequency) is
automatically nulled by the IF reject circuitry.
• Probe CMRR specifications are not compromised as happens when the ac coupling
adapter is used.
• There is a selectable low frequency corner with -3dB points at 1.7 Hz (LFR1) or 0.14Hz
(LFR2).
• The voltage reject range is ±18 V with the probe alone, ±180 V with the 10:1
attenuator, and ±500 V with the 100:1 attenuator.
With the frequency and voltage characteristics noted elsewhere in this manual, low
frequencies are nulled from the input signal.
22
If Reject
ac Coupling Adapter
±18 V
±200 V
±180 V
±500 V
±500 V
±500 V
Select If Reject
Attach ac Coupling
low-frequency
adapter to differential
corner
probe
1
Yes
No
No
No
Yes
Yes
Advertisement
Table of Contents
