Operating Instructions - Tektronix Type B Plug-In Instruction Manual

General
The Type B Plug-In Unit is designed to operate as a
preamplifier for a Tektronix 530-Series, 540-Series or 550-
Series Oscilloscope.
in that manner in the following instructions.
Input Connections
Be careful when you make connections to the preamp
INPUT connectors that the external circuitry does not cause
deterioration of the waveform.
cables may cause ringing or loss of frequency response. If
you use unshielded leads, keep them short as possible to
minimize hum. Leads which pass near the cathode-ray-
tube screen may pick up some ripple from the high-voltage
power supply. If this occurs try relocating the leads or use
additional shielding.
Two cables can be connected to the preamp at once. You
can then select the signal on either cable with the INPUT
SELECTOR switch.
larger than the other, some crosstalk may occur and the
cable having the strong signal should be disconnected.
Probe Information
Early Type B Units were furnished with P400-series or
P500-series probes.
Probe
Color Code
P405
Green
P410 Brown
P420 Red
P450 Clear-Green
P450-L t
Clear-Green
P4100 Clear
* W h en connected to instruments having 2 0 f i f i f input capacitance.
* * W hen connected to instruments having 5 0 f i / i i input capacitance,
t W ill not adjust to instrument having over 2 5 fi/x t input capacitance.
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W e assume that it w ill be operated
Improper termination of
However, if one signal is very much
P500-series probes are usable in the
PROBE CHARACTERISTICS
Attenuation
Ratio
Resistance
(megohms)
5:1
10:1
20:1
50:1
50:1
100:1
IN S TR U C TIO N S
range from DC to 10 megacycles. P400-Series probes should
be used with 540- and 550-series oscilloscopes where fre­
quencies in excess of 10 megacycles are likely to be en­
countered.
P400-series probe bodies are 3 /4-inch in diameter. They
are molded of fiberglass-reinforced alkyd and have on inter­
nal brass shield. Noses are color-coded to indicate attenua­
tion ratios. Length is 33 /4 inches without tip. Two Tektips
were furnished with each probe— a straight tip and freely-
rotating hooked tip.
about one inch, adding less than 0.5 /x/xf to the input cap­
acitance. P400-series probes have a 42-inch coaxial cable
with uhf connector.
Probe Adjustment
The Type P6000 probe may be used with either the 530-
or 540-Series Oscilloscopes. Be sure to check the adjustment
of the probe when you first connect it to the plug-in. Touch
the probe tip to the calibrator output connector and dis­
play several cycles of the calibrator waveform. If the top
and bottom of the displayed waveform is not flat, loosen
the locking ring by turning it in a counterclockwise direction.
Rotate the barrel of the probe as necessary to compen­
sate the probe. Tighten the locking ring carefully after com­
pensating the probe, being careful not to disturb the probe
adjustment.
An adjustable capacitor compensates for slight variations
in input capacitance from one instrument to another. This
INPUT IMPEDANCE
Typical Capacitance
Minimum * Maximum * *
5 12 /x/xf 1 9 /x/xf
10 8 /x/xf 11 /x,uf
5.5 /x/xf 7
10
3.5 /x/xf
10 3.5 /x/x f
10 2.5 /x./xf 2.5 /x/xf
2.5 /x/xf
10
OPERATING
The tips increase probe length by
Insertion Loss
at 30 me (db)
1 to 2
1
1
/ X / x f
1
1
1
Voltage
Rating
(Peak-to-Peak)
600
600
600
1000
1000
1000
2-1