Operating Characteristics And Probing Techniques - Tektronix P5200 Instruction Manual

Operating Basics

Operating Characteristics and Probing Techniques

This section explains the operating characteristics of the P5200 probe
along with techniques you can use to maximize the performance of
the probe.
Operating Limits
The P5200 probe has two operating ranges that you select with the
ATTENUATION button on the front panel:
Select the 50X range for inputs of 0 V to 130 V (DC + peak AC).
Select the 500X range for inputs of 130 V to 1300 V
(DC + peak AC).
Both ranges are rated for the maximum input limits, but you can obtain a
useful measurement only if the voltage you apply is within the specified
limits of the operating range.
Overrange Detection
Differential voltage outside the operating range will overdrive the
circuitry of the probe and distort the output signal. When this
differential overrange occurs, the probe detects the condition and lights
the overrange indicator. With the Audible Overrange ON, the probe
will also emit an audible alarm.
Common-mode voltage greater than 1,000 V
signal, but the probe will not indicate an overrange condition.
Common-Mode Rejection
The common-mode rejection ratio (CMRR) is the specified ability of
P5200 High Voltage Differential Probe to reject signals that are common
to both inputs. More precisely, CMRR is the ratio of the differential gain
to the common-mode gain. The higher the ratio, the greater the ability
of probe to reject common-mode signals. For exact specifications, see
the Specifications section. (See Table 3 on page 16.)
Common mode rejection decreases as the input frequency increases.
The following Figure is a plot of typical CMRR of the probe versus
input frequency. For example, if you apply a 60 Hz line voltage of
500 V
P-P
80 dB (typical) and the signal appears as only a 50 mV
oscilloscope screen.
10
to both input leads of the probe, the probe rejects the signal by
can distort the output
RMS
signal on the
P-P
P5200 Instruction Manual