Tektronix P6248, Service Manual

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P6248 1.7 GHz Differential Probe Service Manual
1
Specifications
The specifications in Tables 1 through 4 apply to a P6248 differential probe
installed on a Tektronix TDS 694C oscilloscope. When the probe is used with
another oscilloscope, the oscilloscope must have an input impedance of 50
Ω
.
The probe must have a warm-up period of at least 20 minutes and be in an
environment that does not exceed the limits described in Table 1. Specifications
for the P6248 differential probe fall into three categories: warranted, typical, and
nominal characteristics.
Warranted Characteristics
Warranted characteristics (Table 1) describe guaranteed performance within
tolerance limits or certain type-tested requirements. Warranted characteristics
that have checks in the
Performance Verification section are marked with the
n
symbol.
Table 1: Warranted electrical characteristics
Characteristic Description
n
DC attenuation accuracy
±
2% for input voltages
±
750 mV (
÷
1) and
±
7.5 V (
÷
10)
±
5% for input voltages
±
850 mV (
÷
1) and
±
8.5 V (
÷
10)
Maximum non destructive input voltage
±
25 V
(DC + peak AC)
between signal and common of the same channel
n
Differential signal range (DC coupled)
±
8.5 V at attenuation setting of
÷
10
±
850 mV at attenuation setting of
÷
1
Common-mode signal range (DC coupled)
±
7 V
n
Output offset voltage
±
10 mV (+20 to +30
_
C, +68 to +86
_
F)
±
50 mV (0 to +50
_
C, +32 to +122
_
F)
n
Rise time (probe only) <265 ps
n
Common-mode rejection ratio 45 dB at 1 MHz in
÷
10 j
25 dB at 100 MHz in
÷
10
20 dB at 500 MHz in
÷
10 20 dB at 500 MHz in
÷
10
18 dB at 1 GHz in
÷
10 18 dB at 1 GHz in
÷
10
60 dB at 1 MHz in
÷
1
38 dB at 100 MHz in
÷
1 38 dB at 100 MHz in
÷
1
35 dB at 500 MHz in
÷
1 35 dB at 500 MHz in
÷
1
30 dB at 1 GHz in
÷
1
Bandwidth (probe only) DC to
≥
1.5 GHz (-- 3dB)
Temperature Operating: 0 to +50
_
C (+32 to +86
_
F),
0 to +60
_
C (+32 to +122
_
F)
1
(probe head)
Nonoperating: --55 to +75
_
C (--131 to +167
_
F)
1