Tektronix 59 Product guide

TEK 59 IRB 2-24-64
INSTRUMENT REFERENCE BOOK
for the Tektronix type
59
amplifier
plug-in unit
For all serial numbers
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©, 19M, Tektronix, Inc., P. 0. Box 500
Beaverton, Oregon. All rights reserved.
2-24-64 TEK 59 nm

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Inter-City Mfg. Co., Inc.
St. Loui, II, Mo.

CONTENJS...SALES
CATALOG
Characteristics (see manual in ENGINEERING section)
COMPATIBILITY
Compatibility with 560 series, 8-15-62
TEK 59 IRB 2-25-65

COMPATIBILITY
COMPATIBILITY WITH 560 SERIES
The type 59 is directly compatible with the following
instruments:
561 all sn
RM561 all sn
561A all sn
RM561A all sn
565 all sn
RM565 all sn
*567 all sn
*RM567 all sn
*Does not provide digital readout, provides crt
display only.
TEK 59 IRB 2-24-64
8-15-62

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PERFORMANCE
Current requirements
TECHNOLOGY
Operating instructions
Circuit description
TEK 59 IRB 2-25-65
CONTENJS...ENGINEERING

PERFORMANCE
POWER DRAIN -- 560 SERIES PLUG-INS
The power supply loading indicated below will vary
somewhat with line-voltage and front-panel control
settings. Where series-regulator shunts are indi-
cated, the shunt consists of 2 k in the indicator unit
in series with O to 6k in the plug-in, the series
combination connected between the unregulated sup-
ply and the regulated supply (in the -100 v supply,
between the unregulated +supply and ground). The
shunt supplies the extra current drawn by the plug-
in beyond that which can be handled by the series
regulator. The actual amount of shunt current varies
with line-voltage, so if a positive power-supply bus
in the plug-in is opened to take a current reading,
the reading will be in error unless the bus is opened
on the load side of the shunt connection (with the
shunt still connected). The -100 v bus carries the
entire load current, so a current measurement at
Plug-In -100 v, shunt -12.2 V
(2A)59 31 1.8 k 0
TEK 59 IRB 7-1-65
Geoff Gass, 5-21-65
the plug-in connector is always correct for this
supply. There is no shunting for the -12.2vsupply.
CAUTION: The values below should not be used to
determine if there is any "extra" power available
in the compartment for other purposes or plug-in
modifications. The values of the shunts, the total
dissipation in the plug-in, the limitations of the in-
dicator (transformer and series regulators) and the
characteristics of the other plug-ins with which a
given plug-in may be used all limit the amount of
power "available" in a given plug-in compartment;
in most cases, there is little or no margin allowed
for extra current drain without modification of the
shunts or circuitry. See 040-0245-00 instructions
and power drain discussion inP RB' s for indicators.
+125 v, shunt +300 v, shunt 6.3 v AC 117v
12 -- 18 -- 1.2A 0

TYPE 59 AMPI.IfIfR
INTRODUCTION
The Type 59 Amplifier module, Fig. l, is designed for
use with Tektronix Type 560-Series Oscilloscopes. It i,s a
simple paraphase amplifier with a maximum gain of slightly
over 20. The forward end of the chassis has been left
free of circuitry in the anticipation that a user may wish
to install additional circuitry to fit the Type 59 module to
his own special application.
The Type 59 module has a maximum sensitivity of one
volt or less per division of deflection and a bandpass of
de to 400 kc at maximum sensitivity. Sensitivity is variable
by means of a continuously variable attenuator at the input.
Input resistance is 250 k, and the maximum allowable ap-
plied signal voltage (de plus peak ac) is 600 volts.
OPERATINGINSTRUCTIONS
Throughout the instructions that follow, it is assumed, un-
less otherwise stated, that the Type 59 module is inserted
in the Y-axis opening of a Type 560-Series Oscilloscope,
thereby providing vertical deflection of the oscilloscope
trace. If the module is inserted in the X-axis opening, it
will provide horizontal deflection of the trace, and the
instructions must be interpreted accordingly. It is further
assumed that there is a time-base module in· the X-axis
opening of the oscilloscope.
Signal Connections
The signal to be displayed is applied to the INPUT con-
nector on the front panel of the module. For best results,
the signal should be applied through a shielded cable, with
the shield connected to the chassis of both the oscilloscope
and the signal source. Leads should be kept as short as
possible.
Displaying a Signal
To display a signal on a Type 560-Series bscilloscope
with the Type 59 Amplifier module, proceed as follows:
1. Apply a signal to the INPUT connector, preferably
through a shielded cable.
2. Connect the oscilloscope chassis to signal ground.
3. Set the time-base controls to produce a stable display.
4. Set the VARIABLEGAIN and POSITION controls so that
the signal is ,placed as desired on the graticule. In general,
if you are interested only in the ac component of the signal,
you should set the AC-DC-GND. switch to AC; if you are
interested in the de level of the signal, you should set the
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AC-DC-GND. switch to DC. An exception to this is in ob-
serving low-frequency ac signals. When the AC-DC-GND.
switch is at AC, the lower bandpass limit (3-db point) of
the module is about 7 cps; therefore, the best response to
signals having frequency components of less than 7cps will
be obtained with the AC-DC-GND. switch in the DC posi-
tion.
To make voltage measurements with the Type 59 module
you must establish a suitable deflection factor for each
measurement or group of measurements to be taken. To
establish this deflection factor, proceed as follows:
1. Set the AC-DC-GND. switch to DC.
2. Display a Calibrator signal of approximately the same
amplitude as the voltage to be measured.
3. Adjust the VARIABLEGAIN control for a given number
of divisions of deflection on the screen.
4. Divide the amplitude of the Calibrator signal by the
number of divisions of deflection. This is the deflection factor
of the module in volts per division.
NOTE
When making any voltage measurements with the
Type 59 module, make sure there is a common
ground between the oscilloscope and the signal
source.
To measure the potential difference between two points
on a signal, such as peak-to-peak ac volts, proceed as
follows:
1. Establish a suitable deflection factor as described in the
preceding paragraphs. Do not move the VARIABLEGAIN
control after the deflection factor has been established.
2. Set the AC-DC-GND. switch to AC.
3. Display the signal and measure the vertical distance, in
graticule divisions, between the two points whose potential
difference you wish to measure.
4. Multiply the measurement obtained in step 3 by the de-
flection factor established in step 1. This is the potential
difference between the two points on the waveform.
To measure the de level of a given point on a waveform,
proceed as follows:
1. Establish a suitable defection factor as described pre-
viously. Do not move the VARIABLE GAIN control after
the deflection factor has been established.
2. Set the AC-DC-GND. switch to GND.

Typll! 59 Amplifier
3. Position a free-running trace (or spot, if you are not us-
ing a time-base module) so that it lies along one of the hori-
zontal lines of the graticule. This line will be used as a
zero reference line; its position in any given case will depend
upon the polarity and amplitude of the voltage to be mea-
sured. Do not adjust the POSITION control of the Type 59
module after this reference line has been established.
4. Set the AC-DC-GND. switch to DC and display the sig-
nal to be measured.
5. Measure the vertical distance, in graticule divisions, from
the reference line established in step 3 to the point whose
de level you wish to measure.
6. Multiply the distance obtained in step 5 by the deflection
factor established in step 1. This is the de level of the point
you wish to measure. If the point is above the zero refer-
ence line, its potential is positive with respect to zero; if the
point is below the zero reference line, its potential is nega-
tive with respect to zero.
Note that you can reestablish your zero reference line at
any time merely by placing the AC-DC-GND. switch to
GND.; you do not need to disconnect the probe from the
signal source. If desired, you can establish a reference other
than zero by placing the AC-DC-GND. switch to DC, con-
necting the signal probe to the desired reference voltage,
and positioning the trace as described in step 3 of the pro-
cedure.
CIRCUITDESCRIPTION
The Type 59 Amplifier module consists of an Input CF
stage, V434A, and an Output Amplifier stage, V434B-V444A.
The output stage is a cathode-coupled paraphase amplifier,
which converts the single-ended input signal to a push-pull
output signal. With the VARIABLEGAIN control set fully
clockwise (maximum gain position), the amplifier has a
gain of about 20.
The front-panel POSITION control effectively moves resis-
tance from the cathode circuit of one side of the paraphase
amplifier to the cathode circuit of the other. This varies the
quiescent currents through the tubes inversely to one another.
The quiescent current through V434B and \/444A are further
controlled by the setting of the POSITION RANGE adjust-
ment, thereby controlling the range through which the POSI-
TION control will position the signa1 on the screen. The
proper method of setting the POSITION RANGE adjustment
is described in the Calibration instructions.
The ferrite beads threaded on the plate leads of the two
Output Amplifier tubes are parasitic suppressors to control
high-frequency oscillations.
2
The Trigger Pickoff circuit samples the plate signal of
V444A and applies the sample through V444B to the trigger
input circuit of the time-base module in the other oscillo-
scope opening, if one is used. There is about 4 volts of
signal at the cathode of V444B for each division of deflec-
tion on the screen.
TROUBLESHOOTING
In the following discussion it is assumed that you have
read the general maintenance and troubleshooting informa-
tion contained in the oscilloscope manual and have definite-
ly isolated a trouble to the Type 59 module by the pro-
cedures described there.
Since there are only two tubes in the Type 59 module, the
first thing to do in case of trouble is to replace both tubes.
If this does not eliminate the trouble, check the rest of the
circuit by voltage and resistance measurements. Typical
voltages to be encountered at certain points throughout the
module are given on the schematic diagram at the rear of
this section. Resistance measurements will usually be point-
to-point checks for which the proper value can be approxi-
mated from the schematic diagram.
CALIBRATION
Calibration of the Type 59 module is performed with the
module inserted in either opening of a Type 560-Series
Oscilloscope. There need not be a module in the other
'oscilloscope opening, although either an amplifier or time-
base module may be there. The only test equipment re-
quired for the calibration is a de voltmeter.
POSITIONRANGEAdjustment
To properly set the POSITION RANGE adjustment (see
Fig. 2), set the POSITION control to midrange, and adjust
the POSITION RANGE adjustment to center a free-running
trace, or spot, on the screen.
INT.TRIG.DCLEVELAdjusiment
To properly set the INT. TRIG. DC LEVELadjustment (see
Fig. 2), proceed as follows:
1. Set the AC-DC-GND. switch to GND. and center the
trace or spot on the screen.
2. Set the INT. TRIG. DC LEVELadjustment so that the po-
tential at pin 11 of the interconnecting plug is exactly zero
with respect to ground.
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Inter-City Mfg. Co., Inc.
St. Louis II,_Mo.

CLERICAL
History
MODIFICATIONS
Modification summary
Strip layout
MAINTENANCE NOTES
CONTENfS...MAINTENANCE
Troubleshooting section of manual (see manual in ENGINEERING section)
PARTS
Parts list
Mechanical parts list
CALIBRATION
Factory calibration procedure
Manual calibration procedure (see manual in ENGINEERING section)
SCHEMATICS
TEK 59 IRB 7-14-65