Tektronix TYPE Z PLIG-IN, Instruction Manual

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General Information
The Type Z Plug-In Unit is a calibrated differential com­
parator preamplifier designed for use in all Tektronix
Type 530-, 540-, 550-, or 580-Series Oscilloscopes. The
unit may be used for three different modes of operation:
(1) as a conventional plug-in preamplifier, (2) as a differential
input preamplifier, or (3) as a calibrated differential com-
pa rator.
As a conventional preamplifier, the Z Unit alone has a
risetime of 24 nanoseconds and a maximum sensitivity of
0.05 volt per centimeter of deflection. Table 1-1 summar­
izes the risetimes and bandwidths available when the Z
Unit is used in combination with various types of Tektronix
oscilloscopes.
TABLE 1-1
Z Unit and
Type:
Risetime in Bandwidth, —3 db,
Nanoseconds* | Megacycles/Second*
532
70 5
531 or 535
39 9
536 40
9
531 A, 533, or 535A 35
10
541, 543, 545,
541 A, 545A,
551, or 555
27 13
581 or 585**
27 13
*Fo r signals which do not overscan the g raticule.
**Typ e 81 or Type 81A A d ap ter must be used.
In differential input mode of operation, the dynamic
range of ± 1 0 0 volts allows the application of common­
mode signals up to 100 volts to be applied to the unit with­
out attenuation.
The common-mode rejection ratio of
40,000 to 1 at dc or low frequencies allows measurement
of differential signals less than 50 mv in amplitude on
±100-volt common-mode signals.
As a calibrated differential comparator, the Z Unit has
an effective screen height of ± 2000 cm at maximum sensi­
tivity. Within the dynamic range of ± 1 0 0 volts, calibrated
± D C comparison voltages can be added differentially to
the input waveform to permit a maximum of 0.005% or
5 mv per mm to be accurately resolved.
Vertical Deflection Factors
0.05 to 25 volts per centimeter in nine calibrated steps;
also continuously variable (uncalibrated) between steps and
up to 60 volts per centimeter.
Input Impedance
1 megohm ± 1 % paralleled by 24 pf.
Maximum Allowable Combined DC and Peak AC
Input
600 volts, ac-coupled.
Maximum Common-Mode Signal
± 1 0 0 volts at 0.05 volt per centimeter. Higher voltages
are permissible with larger vertical deflection factors.
Common-Mode Rejection Ratio
40,000 to 1 at 0.05 volt per centimeter with a 1-kc sine
wave, lower at other sensitivities and higher frequencies.
At 0.05 volt per centimeter, a 200-volt (p-p) 1-kc common­
mode signal produces less than 1 mm of vertical deflection.
Comparison Voltages Available
Three voltage ranges are provided: 0 to ± 1 volt, 0 to
± 1 0 volts, and 0 to ± 1 0 0 volts. An accurate 10-turn
potentiometer is used to select the comparison voltages
over these ranges.
Comparison Voltage Regulator
A regulator circuit maintains comparison voltages es­
sentially constant and independent of normal power supply
voltages supplied by the oscilloscope.
® I
1-1