Fluke 5080A/SC User manual

September 2010
© 2010 Fluke Corporation. All rights reserved. Printed in USA. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
5080A/SC
Oscilloscope Calibration Option
Users Manual
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LIMITED WARRANTY AND LIMITATION OF LIABILITY
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does not warrant that software will be error free or operate without interruption.
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11/99
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i
Table of Contents
Title Page
Introduction........................................................................................................ 1
Oscilloscope Calibration Option Specifications ................................................ 1
General Specifications ....................................................................................... 2
Detailed Specifications ...................................................................................... 2
Voltage Function ........................................................................................... 2
Edge Function................................................................................................ 3
Leveled Sine Wave Function......................................................................... 3
Time Marker Function................................................................................... 3
Trigger Signal for the Time Marker Function ............................................... 4
Trigger Signal for the Edge Function............................................................ 4
Oscilloscope Connections.................................................................................. 4
Starting the Oscilloscope Calibration Option .................................................... 4
The Output Signal.......................................................................................... 5
Adjusting the Output Signal .......................................................................... 5
Keying in a Value...................................................................................... 5
Adjusting Values with the Rotary Knob ................................................... 6
Using the and .............................................................................. 6
Resetting the Oscilloscope Option ................................................................ 6
Calibrating the Voltage Amplitude on an Oscilloscope..................................... 7
The Volt Function.......................................................................................... 7
The V/DIV Menu .......................................................................................... 7
Shortcuts for Setting the Voltage Amplitude ................................................ 8
Amplitude Calibration Procedure for an Oscilloscope.................................. 8
Calibrating the Pulse and Frequency Response on an Oscilloscope.................. 9
The Edge Function ........................................................................................ 10
Pulse Response Calibration Procedure for an Oscilloscope .......................... 10
The Leveled Sine Wave Function ................................................................. 11
Shortcuts for Setting the Frequency and Voltage.......................................... 12
The MORE Options Menu ............................................................................ 12
Sweeping through a Frequency Range .......................................................... 14
Frequency Response Calibration Procedure for an Oscilloscope.................. 14
Calibrating the Time Base of an Oscilloscope................................................... 16
The Time Marker Function ........................................................................... 16
Time Base Marker Calibration Procedure for an Oscilloscope ..................... 17
Summary of Commands and Queries ................................................................ 18
Verification Tables ............................................................................................ 20
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iii
List of Tables
Table Title Page
1. Shape Marker Periods ............................................................................................ 17
2. Overlapped and Coupled Commands..................................................................... 19
3. Voltage Function Verification: AC Voltage into a 1 MΩohm Load..................... 20
4. Voltage Function Verification: AC Voltage into a 50 ΩLoad .............................. 21
5. Voltage Function Verification: DC Voltage into a 50 ΩLoad .............................. 22
6. Voltage Function Verification: DC Voltage into a 1 MΩLoad............................. 22
7. Edge Function Verification .................................................................................... 23
8. Leveled Sine Wave Function Verification: Amplitude.......................................... 23
9. Leveled Sine Wave Function Verification: Flatness.............................................. 24
10. Leveled Sine Wave Function Verification: Frequency .......................................... 27
11. Marker Generator Function Verification................................................................ 27
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List of Figures
Figure Title Page
1. Oscilloscope Connection: Channel and External Trigger ...................................... 4
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1
Introduction
The Oscilloscope Calibration Option provides functions that help you maintain your
oscilloscope’s accuracy by verifying the following oscilloscope characteristics:
•Vertical deflection characteristics are verified by calibrating the voltage gain. The
Volt function lets you compare the voltage gain to the graticule lines on the
oscilloscope.
•Pulse response is checked using the Edge function, by verifying the accuracy of the
oscilloscope’s measurement of pulse transitions.
•Frequency response is checked by verifying the bandwidth using the Leveled Sine
Wave function. A leveled sine wave is monitored until the -3 dB point is observed on
the oscilloscope.
•Horizontal deflection characteristics are verified by calibrating the time base using
the Time Marker function. This calibration procedure is similar to the one for
verifying the vertical deflection characteristics, except that it checks the horizontal
axis.
The menus that implement these functions also include parameters for altering the way
the output signal responds to voltage, frequency, and time settings, giving you control of
the signal during calibration, and providing more methods for observing the signal’s
characteristics.
Oscilloscope Calibration Option Specifications
These specifications apply only to the Oscilloscope Calibration Option. General
specifications that apply to the 5080A Calibrator can be found in Chapter 1 of the 5080A
Operators Manual. The specifications are valid providing the 5080A is operated under
the conditions specified in Chapter 1 of the 5080A Operators Manual, and has completed
a warm-up period of at least twice the length of time the calibrator was powered off, up to
a maximum of 30 minutes.
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General Specifications
All specifications are valid after a warm-up period of 30 minutes, or twice the time since last warmed up, to a maximum of
30 minutes. For example, if the 5080A has been turned off for 5 minutes, the warm-up period is 10 minutes.
Specifications include stability, temperature coefficient, linearity, line and local regulation, and the traceability of the
external standards used for calibration. It is not necessary to add anything to determine the total specification for the
temperature range indicated.
Specification Confidence Level........................... 99 %
Warmup Time ........................................................ Twice the time since last warmed up, to a maximum of 30 minutes.
Temperature
Operating ............................................................ 0 °C to 50 °C
Calibration (tcal).................................................. 15 °C to 35 °C
Storage ............................................................... -20 °C to +70 °C
Temperature Coefficient....................................... Temperature coefficient for temperatures outside tcal ±5 °C is 10 % of
the stated specification per °C for temperatures in the range of 0 °C to
35 °C. Above 35 °C, the temperature coefficient is 20 % of the stated
specification per °C.
Relative Humidity
Operating ............................................................ <80 % to 30 °C, <70 % to 40 °C, <40 % to 50 °C.
Storage ............................................................... <95 %, non-condensing
Altitude
Operating ............................................................ 2,000 m (6,500 ft) maximum
Non-operating ..................................................... 12,200 m (40,000 ft) maximum
Detailed Specifications
Voltage Function
DC Signal Square Wave Signal
Voltage Function Into 50 ΩInto 1 MΩInto 50 ΩInto 1 MΩ
Amplitude Characteristics
Range 0 V to ±2.2 V 0 V to ±33 V 1.8 mV to 2.2 V p-p 1.8 mV to
105 V p-p [1]
Resolution <100 V: 4 digits or 10 μV, whichever is greater
≥100 V: 5 digits
Adjustment Range Continuous [1]
Specification, 1-Year, tcal ±5 °C ±(0.35 % of output +200 μV) [2] [3]
Sequence 1-2-5 (e.g., 10 mV, 20 mV, 50 mV)
Square Wave Frequency Characteristics
Range 45 Hz to 1 kHz
Specification, 1-Year, tcal ±5 °C ±(50 ppm of setting +25 mHz)
Typical Aberration within 30 μs
from leading edge <(3 % of output +200 μV)
[1] The square wave into 1 MΩis a positive square wave from 1.8 mV to 55 V p-p. From 95 V to 105 V. Its output is a square wave-
like signal that alternates between the negative peak and the positive peak, with the centerline at -10 V. Signals between 55 V and
95 V p-p are not available.
[2] The uncertainty of 50 Ωloads does not include the input impedance error of the oscilloscope. Square wave signals below 4.5 mV
p-p have a specification of ±(0.35 % of output +300 μV).
[3] Signals from 95 to 105 V p-p have a specification of 1 % of output in the frequency range 100 Hz to 1 kHz. Typical specification is
3 % of output for 95 V to 105 V p-p signals in the frequency range 45 Hz to 100 Hz.
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Scope Calibration Option
Detailed Specifications
3
Edge Function
Edge Characteristics into 50 ΩSpecification, 1-Year, tcal ±5 °C
Amplitude
Range 4.5 mV to 2.75 V ±(2 % of output +300 μV)
Resolution 4 digits
Adjustment Range ±10 % around each sequence value
(indicated below)
Sequence 5 mV, 10 mV, 25 mV, 50 mV, 100 mV,
250 mV, 500 mV, 1 V, 2.5 V
Other Edge Characteristics
Frequency Range 900 Hz to 1.1 MHz ±(5 ppm of setting +15 mHz)
Rise Time <1 ns
Within 10 ns <(3 % of output +3 mV)
10 to 30 ns <(1 % of output +3 mV)
Leading Edge Aberrations
After 30 ns <(0.5 % of output +3 mV)
Typical Duty Cycle 45 % to 55 %
Leveled Sine Wave Function
Leveled Sine Wave Frequency Range
Characteristics into 50 Ω50 kHz Reference 50 kHz to 100 MHz 100 to 200 MHz [1]
Amplitude Characteristics
Range (p-p) 5 mV to 5.5 V
Resolution <100 mV: 3 digits
≥100 mV: 4 digits
Adjustment Range Continuously adjustable
Specification, 1-Year,
tcal ±5 °C ±(2 % of output +300 μV) ±(3.5 % of output +400 μV) ±(4 % of output +400 μV)
Flatness (relative to 50 kHz) Not applicable ±(1.5 % of output +200 μV) ±(2.0 % of output +200 μV)
Short-term Stability ≤1 % [1]
Frequency Characteristics
Resolution 10 Hz
10 kHz [2] 10 kHz
Specification, 1-Year,
tcal ±5 °C ±5 ppm ±5 ppm ±5 ppm
Distortion Characteristics
2nd Harmonic ≤-33 dBc
3rd and higher Harmonics ≤-38 dBc
[1] Within one hour after reference amplitude setting, provided temperature varies no more than ±5 °C.
[2] At frequencies below 120 kHz, the resolution in 10 Hz. For frequencies between 120 kHz and 999.9 kHz, the resolution is 100 Hz.
Time Marker Function
Time Marker into 50 Ω5 s to 50 ms 20 ms to 100 ns 50 ns to 20 ns 10 ns 5 ns to 2 ns
Specification at cardinal
points, 1-Year,
tcal ±5 °C [2]
±(50 + t*1500) ppm [1] ±5 ppm ±5 ppm ±5 ppm ±5 ppm
Wave Shape spike or square spike, square, or
sq20% spike or square square or sine sine
Typical Output Level >1 V p-p >1 V p-p >1 V p-p >1 V p-p >1 V p-p
Sequence 5-2-1 from 5 s to 2 ns (e.g., 500 ms, 200 ms, 100 ms)
Adjustment Range At least ±10 % around each sequence value indicated above.
Amplitude Resolution 4 digits
[1] t is the time in seconds.
[2] Away from the cardinal points, add ±50 ppm.
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Trigger Signal for the Time Marker Function
Time Marker Period Division Ratio Amplitude into 50 Ω(p-p) Typical Rise Time
5 to 35 ms off, /1 ≥1 V p-p ≤2 ns
34.99 ms to 750 ns off, /1, /10, /100 ≥1 V p-p ≤2 ns
749.9 to 10 ns off, /10, /100 ≥1 V p-p ≤2 ns
9.99 to 2 ns off, /100 ≥1 V p-p ≤2 ns
Trigger Signal for the Edge Function
Edge Signal Frequency Division Ratio Amplitude into 50 Ω(p-p) Typical Rise Time
900 Hz to 1.1 MHz off, /1 ≥1 V p-p ≤2 ns
Oscilloscope Connections
Using the cable supplied with the Oscilloscope Calibration Option, attach the SCOPE
connector on the 5080A to one of the channel connectors on your oscilloscope (see
Figure 1).
To use the external trigger, attach the TRIG OUT connector on the 5080A to the external
trigger connection on your oscilloscope. To use the external trigger and view its signal
with the calibration signal, attach the TRIG OUT connector to another channel. See your
oscilloscope manual for details on connecting and viewing an external trigger.
gjm001.eps
Figure 1. Oscilloscope Connection: Channel and External Trigger
Starting the Oscilloscope Calibration Option
Press to start the Oscilloscope Calibration Option. The Control Display opens the
Volt menu, shown below, which contains options for calibrating the vertical gain on your
oscilloscope. This is the first of four calibration menus, which you can scroll through by
pressing the softkey under MODE. Each menu is described in detail in this chapter.
gjm014.eps
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Scope Calibration Option
Starting the Oscilloscope Calibration Option
5
The Output Signal
The location of the output signal is indicated on the Control Display (the display on the
right side). If your 5080A is connected, but the output does not appear on the
oscilloscope, you may have the 5080A in standby mode.
The settings for the output signal are indicated in the Output Display (the display on the
left side). The following example shows the default settings for Volt mode, which are set
when you start the Oscilloscope Calibration Option.
gjm002.eps
If STBY is displayed, press the key. The Output Display will show OPR and the
output should appear on the oscilloscope.
Adjusting the Output Signal
The 5080A provides several ways to change the settings for the output signal during
calibration. Since oscilloscope calibration requires many adjustments of the output signal,
the three available methods for changing these settings for oscilloscope calibration are
summarized below. These methods provide the means of jumping to a new value or
sweeping through a range of values.
Keying in a Value
To key in a specific value directly into the 5080A from its front panel:
1. Key in the value you want to enter, including the units and prefixes. For example to
enter 120 mV press . The Control Display will show:
gl002i.eps
Note
Units and prefixes printed in purple in the upper left corner of the keys are
accessed through the key. For example, to enter 200
μ s in marker
mode, push .
If you make an error, press to clear the Control Display and return to the menu.
2. Press to activate the value and move it to the Output Display.
gjm010.eps
Other settings in the display will remain unaltered unless you key in an entry and
specify the units for that setting.
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Adjusting Values with the Rotary Knob
To adjust values in the Output Display using the rotary knob:
1. Turn the rotary knob. A cursor appears in the output display under the lowest digit
and begins changing that digit. If you wish to place the cursor in the field without
changing the digit, press .
gjm011.eps
2. To move the cursor between the voltage and frequency fields, press .
gl004i.eps
3. Use the and keys to move the cursor to the digit you want to change.
4. Turn the rotary knob to change the value.
When you use the rotary knob in either Volt mode or Marker mode, the Control
Display shows the new value’s percentage change from the reference value. This is
useful for determining the percentage of error on the oscilloscope. You can set the
reference value to the new value by pressing .
gjm013.eps
5. Press to remove the cursor from the Output Display and save the new value
as the reference value.
Note
If you attempt to use the rotary knob to adjust a value to an amount that is
invalid for the function you are using, or is outside the value’s range limit,
the value will not change and the 5080A will beep. If you need to reach a
different range of values, turn the knob quickly to jump to the new range.
Using the and 
The and keys cause the current value of the signal to jump to a pre-determined
cardinal value, whose amount is determined by the current function. These keys are
described in more detail under the descriptions for each function.
Resetting the Oscilloscope Option
You can reset all parameters in the 5080A to their default settings at any time during
front panel operations by pressing the key on the front panel.
After resetting the 5080A, press to return to the Oscilloscope Calibration Option (the
Volt menu appears). Press to reconnect the signal output.
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Scope Calibration Option
Calibrating the Voltage Amplitude on an Oscilloscope
7
Calibrating the Voltage Amplitude on an Oscilloscope
The oscilloscope voltage gain is calibrated by applying a low frequency square wave
signal and adjusting its gain to meet the height specified for different voltage levels,
designated by the graticule line divisions on the oscilloscope. The signal is applied from
the 5080A in Volt mode. The specific voltages that you should use for calibration, and
the graticule line divisions that need to be matched, vary for different oscilloscopes and
are specified in your oscilloscope’s service manual.
The Volt Function
The Voltage gain is calibrated using the Volt function. This function is accessed through
the Volt menu, which appears when you start the SCOPE option, or when you press the
softkey under MODE to scroll through the oscilloscope calibration menus.
gjm003.eps
Each menu item is described below:
•OUTPUT @ SCOPE Indicates the location of the signal output. If the signal does
not appear on the oscilloscope, press . To disconnect the signal, press .
•DC -> AC or DC <- AC Toggles between a dc and ac signal. Pressing the softkey
from the ac signal produces the dc equivalent output.
•SCOPE Z Toggles the calibrator’s output impedance setting between 1 MΩand
50 Ω.
•V/DIV MENU Opens the voltage scaling menu, which lets you select the scale of
the signal in volts per division. This menu is described below in detail, under “The
V/DIV Menu.”
•MODE Indicates you are in Volt mode. Use the softkey to change modes and open
the corresponding menus for the other three oscilloscope calibration modes.
The V/DIV Menu
The V/DIV menu, shown below, sets the number of volts denoted by each division on the
oscilloscope. This menu provides alternative methods for changing the output amplitude
that may be more convenient for certain oscilloscope applications. To access the V/DIV
menu, press V/DIV from the Volt menu.
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gjm004.eps
Each item in the V/DIV menu is described below.
•V/div Changes the scale of the output display by changing the number of volts that
are represented by each division. The available settings, shown in the figure above,
are provided in 1-2-5 step increments. Press the softkey under UP to increase the
volts per division. Press the softkey under DOWN to decrease the volts per division.
•# DIV Specifies the number of divisions that establish the p-p value of the
waveform. The value can be adjusted from one to eight divisions. The amount
denoted by each division is displayed in the V/div field. Press the softkey under UP
to increase the signal’s height, and press the softkey under DOWN to decrease it.
Shortcuts for Setting the Voltage Amplitude
The and keys step the voltages through cardinal point values of an oscilloscope
in a 1-2-5 step sequence. For example, if the voltage is 40 mV, then pressing 
increases the voltage to the nearest cardinal point, which is 50 mV. Pressing 
decreases the voltage to the nearest cardinal point, which is 20 mV.
Amplitude Calibration Procedure for an Oscilloscope
This example procedure describes how to use the Volt menu to calibrate the
oscilloscope’s amplitude gain. During calibration, you will need to set different voltages
and verify that the gain matches the graticule lines on the oscilloscope according to the
specifications for your particular oscilloscope. See your oscilloscope manual for the
recommended calibration settings and appropriate gain values.
Before you start this procedure, verify that you are running the oscilloscope option in
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Scope Calibration Option
Calibrating the Pulse and Frequency Response on an Oscilloscope
9
Volt mode. If you are, the Control Display shows the following menu.
gjm015.eps
Perform the following sample procedure to calibrate the vertical gain.
1. Connect the calibrator to Channel 1 on the oscilloscope, making sure the oscilloscope
is terminated at the proper impedance (1 MΩfor this example). Verify that the 
key on the 5080A is lit, indicating that the signal is connected.
2. Key in the voltage level that is recommended for your oscilloscope. For example to
enter 30 mV, press  then press . See “Keying in a Value”
earlier in this chapter.
3. Adjust the oscilloscope as necessary. The waveform should be similar to the one
shown below, with the gain at exactly the amount specified for the calibration
settings for your oscilloscope.
This example shows the gain at 30 mV to be 6 divisions, at 5 mV per division.
gl006i.bmp
4. Change the voltage to the next value recommended for calibrating your oscilloscope
model, and repeat this procedure at the new voltage level, verifying the gain is
correct according to the specifications in your manual.
5. Repeat the procedure for each channel.
Calibrating the Pulse and Frequency Response on an
Oscilloscope
The pulse response is calibrated with a square-wave signal that has a fast leading edge
rise-time. Using this signal, you adjust the oscilloscope as necessary until it meets its
particular specifications for rise time and pulse aberrations.
Following pulse verification, the frequency response is checked by applying a leveled
sine wave and acquiring a frequency reading at the -3 dB point, when the amplitude drops
approximately 30 %.
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The Edge Function
The Edge function is used for calibrating the pulse response for your oscilloscope. To
reach the Edge menu, press the softkey under MODE until “edge” appears.
gjm005.eps
Each option in the Edge menu is described below.
•OUTPUT @ SCOPE terminal (50 Ω) Indicates the location and impedance of the
signal output. If the signal does not appear on the oscilloscope, press . To
disconnect the signal, press .
You cannot change the output impedance in Edge mode.
•TRIG If you are using the external trigger, use this key to toggle the trigger off and
on. When on, the reading will show “/1” which indicates that the external trigger is at
the same frequency as the edge output.
The external trigger can be useful for many digital storage oscilloscopes that have
difficulty triggering on fast rise time signals.
•MODE Indicates you are in Edge mode. Use the softkey to change modes and open
the corresponding menus for the other three oscilloscope calibration modes.
Pulse Response Calibration Procedure for an Oscilloscope
This sample procedure shows how to check the oscilloscope’s pulse response. Before you
check your oscilloscope, see your oscilloscope’s manual for the recommended calibration
settings.
Before you start this procedure, verify that you are running the oscilloscope option in
Edge mode. If you are, the Control Display shows the following menu.
gl028i.eps
Perform the following sample procedure to calibrate the pulse response.
1. Connect the 5080A to Channel 1 on the oscilloscope. Select 50 Ωimpedance or use a
50 Ωtermination directly at the oscilloscope input. Verify that the key is lit,
indicating that the signal is connected.
2. Alter the voltage setting for the signal so it matches the amplitude value
recommended by your oscilloscope manufacturer for calibrating the edge response.
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Scope Calibration Option
Calibrating the Pulse and Frequency Response on an Oscilloscope
11
The default setting is 25 mV @ 1 MHz.
3. For example, on a Fluke PM3392A oscilloscope, start with a signal of 1 V @ 1 MHz.
4. Adjust the scale on your oscilloscope to achieve a good picture of the edge. For
example, on a Fluke PM3392A oscilloscope with a 1 V @ 1 MHz signal, use
200 mV/div.
5. Adjust the time base on your oscilloscope to the fastest position available (20.0 or
50.0 ns/div).
Pulse aberrations
gl007i.eps
6. Verify that your oscilloscope exhibits the proper rise time and pulse aberration
characteristics.
7. Remove the input signal by pressing .
The Leveled Sine Wave Function
The Leveled Sine Wave (Levsine) function uses a leveled sine wave, whose amplitude
remains relatively constant over a range of frequencies, to check the oscilloscope’s
bandwidth. When you check your oscilloscope, you change the wave’s frequency until
the amplitude displayed on the oscilloscope drops 30 %, which is the amplitude that
corresponds to the -3 dB point.
To access the Levsine menu, press the softkey under MODE until “levsine” appears.
Note
Make sure there is no cable connected to TRIG OUT while using the
Levsine function.
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gjm006.eps
Each option in the Levsine menu is described below.
•OUTPUT @ SCOPE terminal (50Ω)Indicates the location and impedance of the
signal output. If the signal does not appear on the oscilloscope, press . To
disconnect the signal, press . You cannot change the impedance while you are in
Levsine mode.
•MORE OPTIONS Opens additional menu items, which are described in detail
under “The MORE OPTIONS Menu.”
•SET TO LAST F Toggles between the current frequency setting and the reference
value of 50 kHz. This option is useful for reverting to the reference to check the
output after you make adjustments at another frequency.
•MODE Indicates you are in Levsine mode. Use the softkey to change modes and
open the corresponding menus for the other three calibration modes.
Shortcuts for Setting the Frequency and Voltage
Three options are available for controlling the sine wave settings.
•SET TO LAST F toggles between the last frequency used and the reference
frequency of 50 kHz, letting you check the output at the reference after you make
adjustments at a different frequency.
•MORE OPTIONS lets you use an automatic frequency sweep and lock the voltage
range, if necessary. The following section provides details on this menu.
•The and keys step frequencies up or down in amounts that let you quickly
access a new set of frequencies. For example, if the value is 250 kHz, changes it
to 300 kHz, and changes it to 200 kHz. For voltage values, and step
through cardinal point values in a 1.2-3-6 sequence.
The MORE Options Menu
When you select MORE OPTIONS, you open options that give you more control over
the frequency and voltage. To access the MORE OPTIONS menu, press the softkey
under MORE OPTIONS in the Levsine menu.
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