Rohde & Schwarz ZPV User manual

ROHDE &SCHWARZ
MGNCHEN
Manual
VECTOR ANALYZER
ZPV
291 .4012.92
R35054 -1

f
c

Table of Contents
Characteristics
Uses
Description
Specifications
Equipment Supplied
Recommended Extras
2j_
2.1
2.2
2.2.1
2.2.2
2.2.3
2.2.4
2.3
2.3.1
2.3.1.1
2.3. 1.2
2.3. 1.3
2.3.2
2.3.2.1
2.3.2.
2
2.3.2.
3
2.3.3
2.3.3.
1
2.3.3»2
2.
3-
3.
3
2.3.3.
4
2.3.4
2.3. 4.1
2.3-
4.2
2.3. 4.3
2.3.5
2.3.6
2.3.7
Preparation forUse and Operating Instructions
Legend for Figure 2-1
Preparation for Use
Exchanging the Plug-in ***
Adjusting to the Local AC Supply
Setting up *
Switching on
Operating Instructions
General **
Basic Settings
Changing the Mode of Operation
Electronic Locking of Pushbuttons
Vector Measurement *
Voltage Measurement in Channel A
Voltage Measurement in Channel B
Measurement of the Voltage Ratio of Channel Bto Channel A
Parameter Measurement *
Reflection Factor Measurement ***
Impedance Measurement *
Admittance Measurement ** * *
Transmission Measurement
Group Delay Measurement
Single Measurement
Continuous Measurement
Measurement of Group Delay Difference
Indication of Reference Value *
Stabilization of Test Results *
Disconnecting the Autoranging Facilities *•
5
5
9
9
9
9
9
10
10
10
10
10
11
11
11
11
12
12
13
13
13
14
14
15
15
16
16
16
R35054 -3

2. 3. 7.1
2. 3. 7.
2
2.3.8
2.3.9
2. 3.9.1
2. 3. 9.
2
2. 3.9.
5
2. 3.9.4
2.4
2.4.1
2.4.2
2.4.3
2.4.4
2.4.5
2.4.6
2.4.7
2.4.8
2.4«8«1
2,4.8.
2
2.4.8.
3
2. 4.8.
4
2.4.8.5
2. 4. 8.
6
2.4.8.
7
2. 4. 8.
8
2. 4. 8.9
2.4.9
2.4.9.
1
2. 4. 9.2
2.4.9.
3
2. 4. 9.
4
2. 4. 9.
5
2. 4. 9.
6
2.4« 9«
7
2.4•9.
8
2.5
2.5.1
2.5.2
Disconnecting the Amplitude Autoranging Facility 16
Disconnecting the Frequency Autoranging Facility ......... 16
Quasi-analog Indication 16
Analog Voltage Outputs *17
IF/1VOutputs 17
SWEEP/1VOutputs 17
EEC. /I VOutputs 17
FCONTE. Output 17
Remote Control 1®
General 1®
Switchover to Local, Remote or Combined. Operation 13
Setting the Device Address 18
Setting the Last Character 18
Disconnecting the Service Request. 19
Programming Commands 19
Internal/External Trigger Operation 19
Data Output 19
Output of Lef thand Readout (j) 19
Output of the Eighthand. Readout (.12.) ..................... 20
Output of Lefthand. and Righthand Readouts (']_ and 1j2) ..... 20
Output of Measurement Range of Channel A20
Output of Measurement Range of Channel B21
Output of Frequency Range of Plug-in 21
Output of DC Voltage at ADC Input 21
Output of Device Status Word 21
Output of Status Byte with Serial Polling 22
Programming Examples for Desktop Calculator TEK 4051 ..... 22
Programming of Device Setting 22
Programming of Frequency Range 22
Reading out aComplete Test Result 23
Transfer of Device Status Word ?3
Service Request (SRQ) when using the ZPV +TEK 4051/52 ... 24
Increasing the Test Rate in Programmed Operation 24
Input and. Output of Reference Value for
Relative Measurements 25
Phase Offset •*25
Measurement of Crys tal Equivalent Circuit Parameters ..... 2J
General 2/
Manual Measurement 28
R38535 -4

2.5.2. 1Vector Measurement •
2. 5.2.2 Measurement Using the S-parameter Option ZPV-B2 28
2.5.5 Automatic Measurement 29
2.5*4 Control Amplifier 50
2. 5.4.1 Hints for the Adjustment of the Potentiometers Pi and P2 31
5.Maintenance and Repair *•52
5.1 Required Measuring Equipment and Accessories 52
5.2 Checking the Rated Specifications 35
5.2.1 Indication Error of Magnitude Range 33
5.2.2 Crosstalk Attenuation 34
5.2.3 Error of Phase Indication 54
3.2.4 llarrowhand Sweeping *55
5.2.5 Basic Setting for Switching on AC Supply 36
3.2.6 Control of Analog Section 36
5.2.7 Operating and Indicating Elements 36
3.2.8 Calculator Routines 37
4. Circuit Description 58
4.1 Analog Section 38
4.1.1 Amplitude Measurement -•38
4.1.2 Phase Measurement •**41
4.1 .3 Narrowband Sweeping 44
4.1 .4 Power Supply *•*46
4.2 Digital Section ••* • 47
4.2.1 Computer Board Y21 48
4.2.2 Memory Board Y32 50
4.2.3 Front Panel Y1 *50
4.2.4 .D/A Converter Y32 52
4.2.5 I.EC Interface (Option ZPV-B1 )*52
J5. Repair Instructions 55
5.1 Required, Measuring Equipment and Accessories 55
5.2 Adjustments 56
5.2.1 Power Supply ***56
5.2.2 IF-Section, Amplitude Measurement Branch 57
5.2.3 Phase Measurement Branch 58
5. 2. 3.1 Phase Indication 59
5.2.4 Narrowband Sweeping 60
R38535 -4.1

5.2.5 .Digital Filter °1
5.3 Trouble Shooting in the Digital Section 62
5.3.1 General 62
5.3.2 Signature Analysis **•••63
5. 3. 2.1 Checking the ROM Content and the Address and Data Busses 64
5.
3
*2.1.
2
Preparation *^4
5. 3*2. 1.3 Checking the Total ROM Content 65
5. 3. 2. 1.4 Trouble-shooting in the ROM Range 65
5. 3. 2.
2
Checking the Entire Digital Section 65
5.3*2. 2.1 Purpose 65
5. 3. 2. 2.
2
Preparation ^5
5. 3. 2. 2.
3
Trouble-shooting in the Digital Section 66
Parts Lists
Circuit Diagrams
Components Plans
R38535 -4.2

2. Preparation for Use and Ope>ratingInstructions
2.1 Legend for Figure 2-1
LOCAL
cor©.
REMOVE
AMPL.
STOP AUTORANGING
AMPL.
STOP AUTORANGING
FREQ.
STOP AUTORANGING
FREQ.
STOP AUTORANGING
LEVEL
REP. STORE
PARAM. CAL.
f,XREF. STORE
Function
Plug-in for ZPV
Slide switch for selecting the local,
remote or combined local plus remote
control mode.
Pushbutton for switching on and off the
amplitude autoranging facility.
Status indication of amplitude
autoranging facility; lights up if
amplitude autoranging is switched off.
Pushbutton for switching on and off the
frequency autoranging facility.
Status indication of frequency
autoranging facility; lights up if
frequency autoranging is switched off.
Digital readout for one component of the
test result.
Quasi-analog tendency indication for one
component of the test result by an IED line.
Pushbutton for storing the voltage
reference value.
Pushbutton for storing a. voltage and
phase reference value for vector mea-
surements and when calibrating the test
setup for parameter measurements.
Pushbutton for storing aphase or
group-delay reference value (depending
on the mode selected)
.
Digital readout for one component of the
test result.
Quasi -analog tendency indication for one
component of the test result by an .LED line.
Status indication of polar coordinate
display; lights up if this mode is
selected.

No Engraving Function
15 r,f Pushbutton for selecting polar coordinate
display.
X, YStatus indication of Cartesian coordinate
display; lights up if this mode is
selected.
il X, YPushbutton for selecting Cartesian
coordinate display.
18 ojnji.1 Power switch
12 RECALL
REF. On/off button for displaying the
reference values in readouts 7and 12;
lights up in the ON state.
20 FILTER On/off button for stabilizing the test
results with the aid of an electronic
filter; lights up if the filter is
switched in.
21 LIN. Luminous button for selecting linear
display of test results.
22 LIN. /REF.
(vsm) Luminous button for selecting linear
display in relation to areference value
(also VSWR in conjunction with 32).
22 LOG. Luminous button for selecting logarithmic
display of test results.
24 LOG.
REF. Luminous button for selecting logarithmic
display in relation to areference value.
25 BLuminous button for selecting voltage
measxirement in channel Band measure-
ment of the phase angle between channel A
and channel B.
26ALuminous button for selecting voltage
measurement in channel Aand measurement
of the phase angle between channel Aand
channel B.
27 B/A Luminous button for selecting ratio
measurement of voltage in channel B
referred to voltage in channel Aplus
measurement of phase angle between
channel Aand channel B.
28 YLuminous button for selecting
admittance measurement.
R35054 -6
i

No. Engraving
50 ft o
75 n&
22
31 DIR. COUPL.
22 Sll, S22
S21, S12
2iL r
CAL.
36 at
21 ISET
f+40 kHz
o
Function
Luminous button for entering the
characteristic impedance of the
test system:
Cn «75 ft
Out =50 ft
Luminous button for selecting
impedance measurement.
Luminous button for entering
information on test setup used:
On =test setup with directional
coupler or VSWR bridge
Out =test setup without directional
coupler or VSWR bridge
Luminous button for selecting mea-
surement of sparameters s^j or Sgg
(reflection factors).
Luminous button for selecting mea-
surement of sparameters or s^
(transmission factors).
Luminous button for selecting group
delay measurement.
Luminous button for selecting fre-
quency deviation adjustment for
automatic group delay measurement;
lights up during the adjustment
procedure.
Luminous button for selecting mea-
surement of group delay deviation from
areference group delay value.
Luminous button for entering the fre-
quency deviation of 40 kHz*
28 AUTO
ho SET f
Luminous button for selecting automatic
group delay measurement with genera-
tor deviation control.
Luminous button for entering the fre-
quency deviation of 4kHz*
Luminous button for entering the test
start in the case of manual two-point
measurement
.
R26757 -7

No.
41
42
is
Engraving
SET
f+0.4 kHz
(J) 47 -420 Hz
220 VT0.65 B235 V
Function
Luminous button for entering the fre-
quency deviation of 0, 4kHz.
AC supply connector
Voltage selector plus fuse holder.
44
45
46
47
115 VT1.25 B1.25 V
AIF/1 V
BIF/1 V
rSWEEP/1 V
Air fiIter of blower.
IF output of channel A.
IF output of channel B.
Recorder output for the magnitude with
narrowband sweeping.
48 fSWEEP/1 V
4g r, XREC./.1 V
50 f,, YREC./l V
51 C0NTR. AF
52
a
ADC/10 V
IEC BUS
Recorder output for the phase with
narrowband sweeping.
Recorder output for the magnitude or
real component.
Recorder output for the phase or
imaginary component
.
Recorder output for deviation control
in the case of automatic group delay
measurement.
DC voltage test input.
IEC bus connector* (24 poles, Amphenol).
R56737 -8

2.2 Preparation for Use
2.2.1
Exchanging the Plug-in
After unlocking the plug-in (_l), it can be withdrawn and exchanged; the
new plug-in should be locked again. During this procedure the ZPV must be
switched off.
2. 2.2 __ Adjusting to the Local AC Supply
The instrument is factory-set for an AC supply voltage of 220 V, the fre-
quency range covering 47 to 420 Hz. Qr changing the position of the voltage
selector 43, the ZPV can be operated also from a11,5, 125 or 235 Vsupply.
To this effect the fuse in 4_3 is unscrewed and the cover of the voltage
selector withdrawn. Then the cover is reinserted such that the mark points
to the desired AC supply, voltage and the corresponding fuse is screwed in:
T1,25 Bfor 115 or 125 V
T0,63 Bfor 220 or 235 V.
The AC supply is connected to 42 using the supplied power cord. Die
instrument performance is not affected by AC supply fluctuations of +10/o
from nominal. In the case of greater variations, atransformer or avoltage
regulator should be connected ahead of the ZPV.
2.2.3
Setting up
The ambient temperature should not exceed 45 C; for this reason, direct
insolation is to be avoided. To permit easy reading of the test results,
atilt stand can be swung out on the bottom of the instrument. The ZPV is
fully isolated from the AC supply and provided with safety earthing.
Chassis connection to the test item is made via the plug-in. If required,
an additional ground connection can be established at the lefthand, lower
screw fixing the front panel.
2.2.4
Switching on
To switch the ZPV on, button 18 is pressed; the instrument is ready for
operation after about 1s. When the ZPV is switched on, the buttons and
the readout should light up.
R35054 -9

Operating Instructions
2£
2.3-
1General
i.r, i»
2.3.1 .1 Basic Settings
After switching the ZPV on, the voltage measurement mode in channel Ais
automatically set. The output of the test result magnitude and phase is
linear (mV). The amplitude and frequency autoranging facilities are con-
nected and filter 20 is switched off.
The position of the mode selector 2 is important; see 2.3. 1.3.
2.3-
1-2 _Changing the Mode of Operation
When changing the mode of operation (vector, parameter, group-delay mea-
surement), automatic switchover to the physical unit (linear or ..Loga-
rithmic, absolute or relative) previously stored in this mode is performed
if meaningful. Changing the unit does not make sense when switching over
from button
25 to 26; 28 to 22? 22. 'to 22*
The information on the test setup entered with 2£ and 31 is applicable
for buttons 28, 22* 22 and 22*
The states selected with 3, 5, 15, 17, 12. and 20 are not stored and are
therefore maintained irrespective of any change of the mode operation.
2 .3.1 .3 Electronic Locking of Pushbuttons
In position REMOTE of switch 2all pushbuttons are electronically locked,
only remote control being possible.
Depending on the mode of operation, some modes of indication do not make
sense or are not realized for the remaining positions of switch 2. These
specific modes cannot be selected due to electronic locking of the push-
buttons. However, the modes of operation as such can be switched in
(22, 26, 27, 28, 22* 22. »22* 2A> and ii>*
R36737 -10

2.3.2 Vector Measurement
2.3. 2.1 Voltage Measurement in Channel A
By pressing button A26, the voltage in channel Aand the phase angle
between channels Aand B, referred to channel A, are measured. The phase
is measured as absolute phase (21 or 2£ pressed) or relative to areference
value (22 or £4 pressed) and indicated in degrees. The following voltage
indication modes can be selected:
a) absolute linear indication in mV by pressing button LIN. 21
b) linear indication referred to areference value by pressing button
LIN. REF. 22
c) absolute logarithmic indication in dEm by pressing button LOG. 23
d) logarithmic indication in dB referred to areference value by
pressing button LOG. /REF. 24.
Hie voltage reference is the measured value at which button LEVEL RnF.
STORE £is pressed. Hie phase reference is the measured value at which
button f, XREF. STORE 11 is pressed.
For the basic setting the voltage reference is 1mV and the phase reference
0°.
2.3.2 .2 _Voltage Measurement in Channel B
By pressing button B25, the voltage in channel Band the phase angle
between channels Aand B, referred to channel. A, are measured. The phase
is measured as absolute phase (2£or 23 pressed) or relative to areference
value (22 or 24 pressed) and indicated in degrees. For voltage indication
and voltage and phase reference values the same applies as under channel A
(see 2.3. 2.1).
2.3 .2.3Measurement of the Voltage Ratio of Channel Bto Channel A
By pressing button B/A 27 the voltages in channel Aand in channel Band
the phase angle between channels Aand B, referred to chaimel A, are mea-
sured. Hie phase is measured as absolute phase (21_ or 23 pressed) or
relative to areference value (22 or 24 pressed) and indicated in degrees.
The following modes of indication can be selected for the ratio of the
voltages
:
R35054 -11

I
a) absolute linear ratio, dimensionless, by pressing button LTN. 21
b) linear ratio, relative to areference ratio, dimensionless, by pressing
button LIN. /REP. 22.
c) absolute logarithmic ratio in dB by pressing button LOG. 3
d) logarithmic ratio in dB, relative to areference ratio, by pressing
button LOG. /REF. 24.
The reference value is the voltage ratio at which button LEVEL REF. STORE
9is pressed. The phase reference is the measured value at which button f,
TREF. STORE 1_1 is pressed.
For defining reference ratio and reference phase at the same time press
button PARAM. CAL. 10.
For the basic setting the reference ratio is 1/1 and the phase reference 0.
2.3-3 Parameter Measurement
(using Option ZPV-B2)
2.3.3..1 Reflection Factor Measurement (s^ ,s^p, a^, VSWR)
By pressing button Sll, S22 32,the voltages in channel Aand in channel B
and the phase angle between channels Aand B, referred to channel A, are
measured. Depending on the plug-in used and the test setup, the button DIR.
COUPL. 3!should be pressed (see also manual of the corresponding plug-in).
Depending on the connection of the test item, the result is, in linear
display (LIN. 21 pressed), either the input reflection factor s^ ^or the
output reflection factor s.The magnitude and phase (r, f15 pressed)
or the real and imaginary components (X, YYJ_ pressed) of these reflection
factors can also be output.
If logarithmic display is selected by pressing button LOG. 23, the output
is the reflection attenuation aof the test item in dB and the phase angle
r
associated with the reflection factor. When pressing button LIN. /REF. 22, the
VSWR of the test item and the phase angle associated with the reflection
factor are output.
For calibrating the test setup with directional couplers and VSWR bridges,
ashortcireuit has to be established in the test plane and button PARAM.
CAL. 10 pressed. In all other cases the test output should be match- terminated
and button PARAM. CAL. 10 pressed.
R36737 -12

2.3.3.2 Impedance Measurement
By pressing button Z30 the voltages in channel Aand in channel Band the
phase angle between channels Aand B, referred to channel A, are measured.
Depending on the plug-in used and on the test setup, button DIB. COUPL. H
and button 50 fl/75 Amust be pressed.
Dependingon the connection of the test item, the result is -in linear
display (LIN. 21 pressed) -either the input or the output impedance in fl.
Pressing r,f displays the magnitude and phase and pressing X, YU
the real, and imaginary components of the test result.
By pressing button LIN./REF. 22 the impedance is normalized to the reference
value of 50 Aor 75 Aselected with button 2£.
Calibration as described under section 2.3*3 -l*
2.3.3.3 Admittance Measurement
By pressing button Y28, the voltages in channel Aand in channel Band the
phase angle between channels Aand B, referred to channel A, are measured.
Depending on tire plug-in used and on the test setup, button DIR. COUPL. 21
and button 50 fl/7.5 fl 22 should be pressed.
Depending on the connection of the test item, the result is -xn linear
display (LIN. 21.pressed) -either the input or the output admittance in
mS.
Pressing button r, f1£ displays the magnitude and phase and pressing
button X, Y17 displays the real and imaginary components of tire test
result. By pressing button LIN./REF. 22 the admittance is normalised to
the reference value of 1/50 fl or 1/75 Aselected with button 2£.
Calibration as described under section 2.3«3*1
•
2. 3.5. 4Transmission Measurement (s^, s^.* a21* al2^
By pressing button S21, S12 22, the voltages in channel Aand in channel B
and the phase angle between channels Aand B, referred to channel A, are
measured. Depending on the plug-in used and on the test setup, button
DIB. COUPL. 21 should be pressed.
R.36737 -13

Depending on the connection of the test item, the result is -in linear
display (LIN. 21 pressed) either the forward transmission factor s21 or
the backward transmission factor s^.
Pressing button r, f15 displays the magnitude and. phase and pressing
button X, YIT the real and imaginary components of these factors.
When selecting logarithmic display with button LOG. 2j5, the output is the
forward or backward transmission factor in dB together with the phase
angle associated with the forward or backward transmission factor.
For calibrating the test setup, connect the equipment without the test
item and press button PARAM. CAL. 10 .
2
.
3.4Group Delay Measurement
(using Option ZPV-B5)
In the modes A, Bor B/A (2£, 26 or 2? pressed) the group delay can be
measured instead of the phase.
2.3.4. 1Single Measurement
Pressing button X(54 conditions the group delay measurement. For performing
individual measurements, buttons SET fQ40, SET fQ+0.4 kHz 41,
SET f+4kHz 39 and SET f4- 40 kHz JL are operated.
QO
The test method is based on two individual phase measurements which are
made at two very closely spaced frequencies. Ihe phase difference Afis
obtained and, using the frequency difference Af, the group delay Xis
calculated from X=Af/2 TT 1st. Ihe three different Af values corre-
sponding to buttons 27,32 and 41 permit three measurement ranges to be
selected:
40 kHz: 0.001 to 9-999 ps
4kHz: 0.01 to 99-99 ps
0.4 kHz: 0.1 to 999.9 ps
The test procedure is as follows:
a) Set the signal generator to the desired test frequency.
b) Press button SET f40.
c) Depending on the expected test result, increase the signal generator
frequency by 40 kHz, 4kHz or 0.4 kHz.
R36737 -14

d) Press button SET f+40 kHz 37, SET f+4kHz 32. or SET fQ+oA mz
4l in accordance with the frequency increase.
e) The test result is indicated on readout 12; for anew measurement start
with a)
.
Since the accuracy of the frequency increase directly influences the test
result, the signal generator should be checked, if required, using afrequency
comter
.
2.3. 4.2 Continuous Measurement
Pressing button T34 conditions the group delay measurement. Button AUTO 38
permits selection of the automatic continuous measurement mode.
For automatic continuous measurements the output CONTR. AF 51 of the ZPV is
connected to the M-DC input of agenerator. As with individual measurements,
the phases of two very closely spaced frequencies are measured and the group
delay is calculated from the phase and the frequency differences.
However, the generator frequency is automatically varied with the aid of
the ZPV. This facilitates operation considerably. The frequency variation
of 0.4 kHz, 4kHz or 40 kHz is determined by pressing buttons SET f. +0.4 kHz
41, SET f+4kHz 39 or SET f+40 kHz 37. The Af setting also fixes the
3QO
corresponding measurement range (see 2.3.4.1).
After connecting the ZPV to the signal generator, the Af voltage should be
matched by calibrating the slope of the generator modulation characteristic.
To this effect the test item is replaced by the supplied calibrating cable
and button CAL. 35 is Pressed. The ZPV performs the calibration automatically,
extinguishing button 35 upon termination.
The linearity and frequency independence of the generator modulation character
istic are essential for the accuracy of the test results. The modulation
sensitivity of the generator should always be in the range 1V/10 kHz to
2.5 V/10 kHz.
2.3. 4. 3Measurement of Group Delay Difference
Pressing button AT 36 conditions the measurement of the group delay differ-
ence relative to areference delay both for the single arid the continuous
modes. Sections 2.3.4.1 and 2.3. 4. 2apply accordingly.
The reference group delay is the value at which button f,TREF. STORE 11_
is pressed.
For the basic setting the reference delay is 0ps.
R36737 -15

Indication of Reference Value
2.3.5
Pressing button RECALL REF. 1£ interrupts the test cycle and causes the
corresponding reference value to be displayed. When button 22. is lit, this
mode i.s switched on. Another push of button 19 makes go out, the test cycle
is continued and the test results appear in the readout.
2.
3.6
Stabilization of Test Results
By pressing button FILTER 20 an electronic filter is connected for stabilizing
the test results. This adaptive filter proves especially useful for low-
level and noisy signals. Another push of button 20 disabl.es the filter and
the luminous button is extinguished.
2.3.7
Disconnecting the Autoranging Facilities
2.3.7.
1
Disconnecting the Amplitude Autoranging Facility
For the vector measurement modes in channel Aand channel Bit may be necessary
to disconnect the amplitude autoranging facility of the amplifier, which uses
10-dB steps, lb this effect, button AMPL. STOP AUTORANGING 2is pressed and
the status indication 4lights up. Another push of button 3causes the luminous
indication 4 to be extinguished and amplitude autoranging is connected again.
In all other operating modes the amplitude autoranging facility of the amplifier
cannot be switched off. Button 2then only affects the recorder outputs KEC/l V.
2. 3.7. 2Disconnecting the Frequency Autoranging Facility
If only one frequency range of the tuner is used, the frequency autoranging
facility can be disconnected to increase the measuring rate and the corre-
sponding range can be set by hand. To 'tills effect button FREQ. STOP AUTORANGING
2is pressed and the status indication 6lights up. After pushing button 5
once again, the luminous indication 6goes out and frequency autoranging is
connected again.
2.
3.8
Quasi -analog Indication
The quasi-analog luminous spot indication 8is associated with the digital
readout 7and the quasi-analog luminous spot indication 12 wi th the digital
readout 12. Although these linear luminous spot indicators feature no
absolute accui’acy, they facilitate the recognition of atendency towards a
maximum or aminimum value and thus prove particularly useful for alignment
R36737 -16

work. In order to increase the system speed these indications can be switched
off by computer command.
2.3.9 Analog Voltage Outputs
2. 3. 9.1 IF/1 VOutputs
The IF voltages of channels Aand Bare available at the two BNC sockets A
45 and B46 on the rear panel. The IF is 20 kHz. Ihe level and phase shifts
of the IF outputs correspond to those of the RF input signals in channels A
and B.
2.3. 9. 2SWEEP/1 VOutputs
During sweep operation, which can be set for instance on the plug-in ZPV-E2
or ZPV-E3, avoltage corresponding to the amplitude of channel Aor Bor to
the ratio of channel B/channel Ais available at ENC socket rSWEEP/1 V47
on the rear panel in modes A, Bor E/A. Ihe voltage present at BMC socket
SWEEP/1 V48 corresponds to the phase angle between channels Aand B. These
voltages are produced in apurely analog way. The amplitude and frequency
autoranging facilities are disabled.
When measuring the ratio B/A the vol tage in channel. Amust be between 35 mV
and 350 mV. This is monitored by the microprocessor and any error is indicated
on the di splay.
2.3.9.3 REC./l VOutputs
At the rear BJC socket r, X4£ an analog voltage corresponding to ihe digital
readout 7is available. The analog voltage present at BJC socket f ,Y50
is associated with digital readout 12. To increase the speed of the system,
these recorder outputs can be switched off by acomputer command. They are
also not enabled during sweep operation since in this case outputs 4Vand 48
are available (see also 2.3*9«2).
The relationship between display modes and recorder outputs can be seen in
table 2-12 .
2.3.9.4 AF CONTR. Output
For automatic group delay measurement BNC socket CONTR. AF 51 is connected
to the FM-DC Input of agenerator to control the deviation frequency
(see also 2.3.4.2).
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2.4 Remote Control
(using Option ZPV-B.1.)
2.4.1 General
The ZPV is equipped with aremote-control connector in. accordance with
Dm -IEC 66.22 (.IEEE 488); this is the 24-pole programming connector Jg
on the rear panel (for contact allocation see table 2-2). The character-
istics realized according to this standard are SHI, Affl., T6, TE6, L4, SRI,
DC1, DTI, RL0, PP0, C0 (see table 2-4).
Only ASCII characters meeting the latest recommendations are used (see
table 2-3). When connecting the ZPV into an IEC bus system it is not
necessary to be familiar with the functioning of the interface. It is
sufficient to know the programming commands and the data output formats
which are explained below.
2.4.2 Switchover to Local, Remote or CombinedOperation
Hie front-panel switch 2permits manual operation (LOCAL), remote control
(REMOTE) and acombined local plus remote mode (COMB.) which is especially
useful for producing test routines.
These three functions cannot be programmed.
2.4.3 Setting the Device Address
Hie talker and the listener addresses are set together in accordance with
table 2-5 using switch SI on the IEC-bus Option ZF1T-B1. Hie factory-set
address of the talker is Z and that of the listener :(corresponding to device
address 26 when using the TEK 4051 ) . Hie address status is indicated on the
readout, either LI (listener) or TA (talker) lighting up.
2.4J| Setting the Delimiter
Switch S2.1 to S2.4 on the IEC-bus Option ZPV-B1 permits setting of the
delimiter furnished by the ZPV at the end of adata transfer (see
table 2-6). This character is factory-set to OR;
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