Tektronix THM500 Series User manual

Instructions Manual
THM500 Series
Instruments
070-9857-01

Bench Test Instruments and Handheld Oscilloscopes Basic Service i
Table of Contents
THM500 Series Instruments 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THM500 Series Specifications 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THM500 Series Performance Verification 9. . . . . . . . . . . . . . . . . . . . . .
Test Equipment 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Test 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DMM Verification 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oscilloscope Verification 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents
ii Bench Test Instruments and Handheld Oscilloscopes Basic Service

Bench Test Instruments and Handheld Oscilloscopes Basic Service 1
THM500 Series Instruments
The Tektronix THM500 Series instruments combine the features of a complete
digital multimeter (DMM) with the power of an oscilloscope, all in a single
package.
The DMM portion of these instruments measure true RMS AC and DC voltage,
resistance, continuity with audible mode, and a diode test.
The DMM portion also includes the following features:
HA hold feature to freeze the display
HMIN and MAX readouts to track instantaneous signal variations from the
last held value (DHold)
HAC and DC current measurement with optional current probe
The oscilloscope portion of the instruments feature an autoranging mode that
completely automates operation. In this mode, a usable signal is always
displayed without operator intervention. If desired, you can switch to manual
mode by selecting any control. In manual mode, you can specify general
oscilloscope operations such as coupling, triggering, and acquisition modes.
THM550, THM560, and THM565 models include preconfigured modes to set up
the oscilloscope for motor testing, transformer THDF measurement, power line
monitoring, and power measurement. The THM57x series instruments include
preconfigured automotive test setups.
Figure 1: THM500 series instrument

THM500 Series Instruments
2Bench Test Instruments and Handheld Oscilloscopes Basic Service
THM500 series instruments will also store waveforms, settings, and displays.
With these features, you can do the following:
HRecall settings
HAutomate test procedures
HSave waveforms and screens in the field for later analysis
HTransfer waveforms and screens to a personal computer
(requires optional communications adapter)

Bench Test Instruments and Handheld Oscilloscopes Basic Service 3
THM500 Series Specifications
The characteristics listed in this section apply under the following conditions:
HThe instrument operates within the environmental conditions specified in
Table 4 on page 8, unless otherwise noted.
HThe instrument warms up for at least 5 minutes.
NOTE. All specifications are warranted unless marked “typical.” Typical
characteristics are not guaranteed but are provided for the convenience of the
user.
The specifications listed for the THM565 also apply to the THM57x series
except as noted in Table 1.
Table 1: How THM565 and THM57x series products differ 57x 565
Modes
Line Test D
Motor Test D
Automotive preconfigured test setups D
Vertical
Mathematics capability D
Invert capability D
Measurements
Voltage Measurement D
Timing Measurement D
Power Measurement D
THDF Measurement D
Automotive Measurements (preconfigured test setups) D
Table 2: DMM specifications 550 560 565
General
Resolution 3#@4digit (4000 count) full-scale reading except as noted D D D
Input Impedance (Typical) VDC or VAC: 10 MW(<10 pF; <70 pF at 400 mV range) D D D

THM500 Series Specifications
4Bench Test Instruments and Handheld Oscilloscopes Basic Service
Table 2: DMM specifications (cont.) 565560550
General
Additional Readouts MIN: Minimum voltage or resistance
MAX: Maximum voltage or resistance
MAX–MIN: Difference between MAX and MIN
HOLD: Value of the main reading when the HOLD button is pressed
DHOLD: Difference between HOLD reading and active reading
D D D
DC voltage
Range and Resolution Range Resolution
400 mV 0.1 mV
4V 1mV
40 V 10 mV
400 V 100 mV
850 V 1 V
Autorange available; selects from all ranges except 400 mV.
D D D
Accuracy ±(0.5% of reading + 5 counts) D D D
Normal Mode Rejection >60 dB typical at user selectable 50 or 60 Hz D D D
Common Mode Rejection >100 dB typical at user selectable 50 or 60 Hz D D D
AC voltage
Range and Resolution (True RMS) Range Resolution
400 mV 0.1 mV
4V 1mV
40 V 10 mV
400 V 100 mV
600 V 1 V
Autorange not available on 400.0 mV range
D D D
Accuracy ±(2% of reading + 5 counts) for 50 or 60 Hz sine wave. Add 2% of reading plus
5 counts for nonsinusoidal signal with crest factor <3.
D D D
W/resistance
Range and Resolution Range Resolution
400 W0.1 W
4kW1W
40 kW10 W
400 kW100 W
4MW1kW
40 MW10 kW
Autorange available
D D D
Accuracy ±(0.5% of reading + 2 counts). 40 MWrange is ±(2% of reading +5 counts) at
≤60% relative humidity.
Derate 4 MWrange to ±(1% of reading + 2 counts) from 60% to 90% relative
humidity.
D D D

THM500 Series Specifications
Bench Test Instruments and Handheld Oscilloscopes Basic Service 5
Table 2: DMM specifications (cont.) 565560550
Diode test
Range 0 to 2 V. Red input connector is positive. D D D
Continuity check
Indication Audible tone and graphic of a closed switch displayed when resistance is <50 W
(typical). Indicators optionally disabled.
D D D
Table 3: Scope specifications 550 560 565
Modes
Autorange (Typical) Autorange mode positions and sets the vertical and horizontal scales to between
30% and 60% of full screen. After 500 ms, the process repeats if the signal
amplitude or period changes. The lower limits of Autorange are 50 mV/div and
100 ms/div. Autorange is the default mode.
D D D
Manual The scope switches to manual operation when any control alters the waveform
display.
D D D
Line Test HWill monitor a 45 to 65 Hz power waveform on CH 1 and check for variations
in amplitude and frequency. Abnormal events, such as spikes, drop-outs, and
substantial frequency variations, will be captured and counted.
D D
HAutomatic print of failures D D
HAutomatic screen save on failures 1 8
HTime and date stamp on failure D
Motor Test Will stabilize (trigger) on pulse-width modulated signals generated by
variable-speed AC motor drives.
D
Vertical
Channels Each channel is identical. 1 2 2
Probe Interface Shrouded banana jack. Accepts 4 mm caged-spring safety style banana plug.
Use probes incorporating 9 leaf-spring contacts only.
D D D
Digitizers 8 bits, 25 Msamples/s 1 2 2
Volts/Division Range 5 mV/div to 500 V/div in a 1-2-5 sequence D D D
Modes Normal and Invert D D D
Coupling DC, AC, COM (COM simulated) D D D
Input Impedance DC Coupled ≤10 pF: ≥975 kWD D D
Analog Bandwidth 5 mV/div: DC to 1 MHz
10 mV/div to 2 V/div: DC to 5 MHz
5 to 500 V/div: DC to 1 MHz
D D D
Maximum Input Voltage 600 VRMS D D D
DC Accuracy (DV) ±(3.5% + 2 pixels) 19_to 27_C; derate by 0.25% per _C outside the range.
Derate additional 0.5% at 5 mV/div. Linear range is ±8 divisions from COM
(common).
D D D
Crosstalk Between Channels ≥100:1 at 5 MHz, with other channel connected to COM (common) D D

THM500 Series Specifications
6Bench Test Instruments and Handheld Oscilloscopes Basic Service
Table 3: Scope specifications (cont.) 565560550
Vertical
Mathematics Subtract: (CH 1 – CH 2)
Add: (CH 1 + CH 2)
D D
Acquisition
Modes Sample (Normal), Spike Detect, Roll, Run/Hold, Smooth, Dynamic DSP D D D
Acquisition Rate All modes except Dynamic DSP: Up to five waveforms per second
Dynamic DSP Mode: Up to 750 waveforms per second
(redisplayed at a slower rate.)
D D D
Horizontal
Time/Division Range 60 s/div to 200 ns/div in a 1-2-5 sequence D D D
Time Base Accuracy ±(0.1% + 1 pixel) D D D
Record Length 256 points D D D
Spike Detect Captures spikes down to 40 ns at all sweep speeds D D D
Single Shot Single shot on two channels simultaneously D D D
Roll 200 ms/div to 60 s/div D D D
Measurements
Cursors Voltage difference between cursors (DV)
Time difference between cursors (DT)
Reciprocal of DT in Hertz (1/DT)
D D D
Voltage and Amperes For voltage or current probes: Maximum (MAX), Minimum (MIN), Peak-Peak
(P–P)
D D D
Timing Frequency (FREQ), Period (PER) D D D
Power Calculates true RMS current, voltage, true power, and power factor from CH 1
current (using current probe) and CH 2 voltage.
D D
THDF (Transformer Harmonic Derating Factor) calculated as
[(RMS Current ×1.41414) ÷Peak Current], read from a current probe on CH 1.
D D
Trigger
Source CH 1 (Default) D D D
CH 2 D D
Modes Auto-Level: Default when in AutoRange mode
Auto: Default in manual operation
Normal: User selectable
Single-Shot: User selectable
D D D
Slope Positive or Negative slope D D D
Sensitivity, Edge-type DC Coupled 0.5 division: 200 to 500 V/div
1 division: 10 to 100 mV/div
2 divisions: 5 mV/div
D D D

THM500 Series Specifications
Bench Test Instruments and Handheld Oscilloscopes Basic Service 7
Table 3: Scope specifications (cont.) 565560550
Waveform display
Display Update Rate Dynamic Display Digital Signal Processing maps up to 750 waveforms/s on
screen, simulating an analog-like display.
D D D
Memories
Setups Each setup memory stores the complete state of the instrument, including the
multimeter state.
4 4 8
Waveforms Each waveform memory stores all waveform points and the scale of the selected
waveform.
4 4 8
Screens Each screen memory stores the exact information displayed on screen
(snapshot).
1 1 8
Table 4: General specifications 550 560 565
Clock D
Real Time Provides date and time stamp capability for line test events and saved
waveforms.
D D D
Display system
Display Type Super Twisted Liquid Crystal Display D D D
Size Width: 120 mm (4.72 inch)
Height: 60 mm (2.36 inch)
D D D
Display Resolution 256 pixels horizontal ×128 pixels vertical D D D
Contrast User adjustable D D D
Backlight Electroluminescent D
Waveform Graticule 8 divisions vertical ×10 divisions horizontal
Default = crosshair, grid, or none
1 vertical division = 15 pixels
1 horizontal division = 25 pixels
D D D
Power source
Batteries Six AA cells (9 V nominal) D D D
Battery Life (Typical) 4.5 hours continuous operation with alkaline cells (backlight off). Tested using
RAYOVACRAlkaline MAXIMUMTbatteries. Battery life extended when used
intermittently.
D D D
Battery Saver User adjusted battery saver feature turns the instrument off after five minutes
and the backlight off after one minute.
D D D
Memory Retention Time Memory hold-up time following battery removal: eight minutes minimum, three
hours typical. Memory retention extended (weeks or months) if discharged
batteries remain installed.
D D D

THM500 Series Specifications
8Bench Test Instruments and Handheld Oscilloscopes Basic Service
Table 4: General specifications (cont.) 565560550
Environmental
Temperature Operating: 0_to 50_C (32_to 122_F)
Storage: –20_to +70_C (–4_to 158_F)
D D D
Humidity, Operating 0_to 40_C (32_to 104_F): Up to 90% relative humidity noncondensing
(60% for 4 and 40 MWmeasurements)
41_to 50_C (106_to 122_F): 60% relative humidity noncondensing.
D D D
Altitude Operating:: 2,200 m (7,221 ft)
Storage:: 12,192 m (40,000 ft)
D D D
Random Vibration 5 to 500 Hz, 10 min/axis, operating: 2.66 gRMS
5 to 500 Hz, 10 min/axis, nonoperating: 3.48 gRMS
D D D
Sine Vibration Operating: 0.06 inch displacement from 5 to 15 Hz
0.04 inch displacement from 15 to 25 Hz
0.02 inch displacement from 25 to 55 Hz
Test Duration: 10 minutes at the peak resonance condition (33 Hz if no
resonance found).
Test performed on each of three axes.
D D D
Half-sine Shock Operating: 30 g with pulse duration of 11 ms. Three shocks per axis.
Test Duration: 10 minutes at the peak resonance condition (33 Hz if no
resonance found).
Test performed on each of three axes.
D D D
EMC
Emissions EN 55011 radiated, class A D D D
Immunity IEC 801-2 electrostatic discharge: Up to 8 kV
IEC 801-3 radiated immunity: 3 V/meter, 27 to 500 MHz
D D D
Mechanical
Size 140 mm (5.5 inch) high ×210 mm (8.3 inch) wide ×43 mm (1.7 inch) deep D D D
Weight 1 kg (2.2 lb) with Alkaline batteries installed D D D
Tripod Socket 0.25 inch ×20 thread ×6.3 mm (0.25 inch) deep D D D
Safety
Certifications Listed UL 3111-1 for 600 V CAT II measurements; CSA-C22.2 No 1010.1-92 D D D
Surge Protection Withstands incidental line surges up to 6 kV (comprised of a minimum rise time
of 1.2 ms and a maximum 50 ms duration, minimum of 2 minutes between
pulses).
Maximum volt-hertz product: 50 V⋅MHz.
D D D
Fuse The instrument has no user-replaceable fuses D D D
General Safety Class 2 D D D

Bench Test Instruments and Handheld Oscilloscopes Basic Service 9
THM500 Series Performance Verification
This section contains procedures to verify that the THM500 Series instruments
perform as warranted. Verify instrument performance whenever the accuracy or
function of your instrument is in question.
The performance verification procedures provide a valid confirmation of
instrument electrical characteristics and function under the following conditions:
HThe instrument operates within the environmental conditions specified in
Table 4 on page 8 during the verification process.
HThe instrument operates continuously for a 5 minute period before the
verification begins.
The performance verification procedure should be performed annually or after
every 2000 hours of operation if used infrequently.
Table 6 lists the equipment needed to complete the performance verification
procedures.
The THM500 Series performance verification consists of the checks listed in
Table 5.
Table 5: Performance verification checks
Functional Test
DMM Verification
DC Voltage Accuracy
AC Voltage Accuracy
Resistance Accuracy
Oscilloscope Verification
Noise
Input Leakage Trace Shift
Time Base Accuracy
Vertical Accuracy
Analog Bandwidth
Crosstalk from DMM to Oscilloscope
Crosstalk Between Oscilloscope Channels
DC Offset

THM500 Series Performance Verification
10 Bench Test Instruments and Handheld Oscilloscopes Basic Service
Test Equipment
The performance verification procedures use external traceable test equipment to
directly check warranted characteristics.
Alternative test equipment must meet or exceed the intended minimum
requirements specified in Table 6. If you substitute equipment, you may need to
modify the procedures.
NOTE. Before beginning the performance verification procedures, warm up the
test equipment according to the manufacturer’s recommendations.
Table 6: Test equipment
Description Minimum requirements Example product
Leveled Sine Wave Generator Output must provide 5 V into 50 Wwith
3% amplitude regulation at 50 kHz to
5 MHz
Wavetek
9
1
00
Universal Calibration
System with Oscilloscope Calibration
Module (Option 250)
Time Mark Generator Output must provide 1 ms markers,
±0.5%, at 1 V amplitude Fluke 5500A Multi-product Calibrator with
Oscilloscope Calibration Option 55
00-S
C
Calibrator
00-S
DC Voltages 300 mV, 3 V, 30 V, 300 V, 500 V, with
accuracy of ±0.125% or better
AC Voltages 300 mV, 3 V, 30 V, 300 V, 500 V, with
accuracy of ±0.5% or better
Resistances 10 W, 100 W, 1 kW, 10 kW, 100 kW,
1MW, with accuracy of ±0.125% or
better
Termination 50 W±2%, 2 W Tektronix 011-0049-xx
BNC Cable 50 W, 1.04 m (42 inch) long Tektronix 012-0057-xx
Safety Banana Lead Patch Cord Tektronix 012-1413-xx
BNC Female-to-Dual-Banana Cable Stacking banana connector Tektronix 012-1450-xx
BNC Female-to-Dual-Banana Adapter Tektronix 103-0090-xx

THM500 Series Performance Verification
Bench Test Instruments and Handheld Oscilloscopes Basic Service 11
Functional Test
The following steps verify basic instrument operation and reset the THM500
series instruments to factory default settings.
1. Install fully charged batteries or use the THMCOM1 Communications
Adapter or the THM5AC Power Adapter optional accessories to provide
power.
2. Press the ON/OFF button to turn the THM500 series instrument on.
3. Press the MENU ON/OFF button to display the menus.
NOTE. The THM575 can display the menus in more than one language. The
language selections are located in the Utility menu.
4. Select UTILITY"STATUS"DISPLAY from the menus.
5. Press the SELECT button. Verify that the correct THM500 series instrument
model number is displayed.
6. Use the menus to select RESET ALL. It will appear underlined.
7. Press the SELECT button and wait for the confirmation message; then press
the SELECT button again.
8. Verify that the instrument returns to its power-on mode:
HTHM550, THM560, THM565, THM570, or THM570U instruments
return to METER mode.
HTHM571, THM575, or THM570U Option 3K instruments return to a
banner screen.

THM500 Series Performance Verification
12 Bench Test Instruments and Handheld Oscilloscopes Basic Service
DMM Verification
The following checks verify the performance of the DMM functions. The
oscilloscope verification begins on page 15.
NOTE. The THM575 can display menus in more than one language. The
language selections are located in the Utility menu.
The following check verifies DC voltage accuracy.
WARNING. This test uses hazardous voltages. If you use standard banana plugs
to apply test signals to the THM500 series instrument, do not touch the exposed
conductors.
1. Set the THM500 series instrument to METER mode displaying V-DC. If
the range display at the lower-right does not indicate AUTO, press the Yand
Bbuttons simultaneously to set the RANGE to AUTO.
2. Connect the voltage source output to the THM500 series instrument DMM
and COM inputs as shown in Figure 2. Assure that the ground connection for
each adapter connects to the common (or ground) connector of its associated
instrument.
3. Set the voltage source for DC output.
Voltage source
THM5xx
COM
DMM+
50 Wcable
BNC to dual
banana adapter
BNC to dual banana cable
Figure 2: DC and AC voltage accuracy test setups
4. For each row of Table 7, use the Yand Bbuttons to set the THM500 series
instrument to the range specified in the first column; then set the voltage
source to the output voltage specified in the second column. Verify that the
THM500 series instrument readout is within the range listed in the third
column.
DC Voltage Accuracy

THM500 Series Performance Verification
Bench Test Instruments and Handheld Oscilloscopes Basic Service 13
Table 7: DC voltage accuracy test limits
Instrument range DC voltage source Instrument readout
400 mV 300 mV 298.0 to 302.0
4V 3V 2.980 to 3.020
40 V 30 V 29.80 to 30.20
400 V 300 V 298.0 to 302.0
850 V 500 V 492 to 508
The following check verifies AC voltage accuracy.
WARNING. This test uses hazardous voltages. If you use standard banana plugs
to apply test signals to the THM500 series instrument, do not touch the exposed
conductors.
1. Set the THM500 series instrument to METER mode displaying V-AC. If
the range display at the lower-right corner does not indicate AUTO, press the
Yand Bbuttons simultaneously to set the RANGE to AUTO.
2. Set the voltage source to 60 Hz AC output.
3. For each row of Table 8, use the Yand Bbuttons to set the THM500 series
instrument to the range specified in the first column; then set the voltage
source to the output voltage specified in the second column. Verify that the
THM500 series instrument readout is within the range listed in the third
column.
Table 8: AC voltage accuracy test limits
Instrument range AC voltage source at 60 Hz Instrument readout
400 mV 300 mV 293.5 to 306.5
4V 3V 2.935 to 3.065
40 V 30 V 29.35 to 30.65
400 V 300 V 293.5 to 306.5
600 V 500 V 485 to 515
4. Set the calibrator output to a safe voltage (less than 20 V) and disconnect the
THM500 series instrument from the calibrator.
5. Disconnect the test setup.
AC Voltage Accuracy

THM500 Series Performance Verification
14 Bench Test Instruments and Handheld Oscilloscopes Basic Service
The following check verifies resistance accuracy.
1. Set the THM500 series instrument to METER mode displaying W. Connect
the THM500 series instrument to the resistance source as shown in Figure 3.
Resistance
source
THM5xx
COM
DMM+
50 Wcable
BNC to dual banana cable
BNC to dual
banana cable
Figure 3: Resistance accuracy test setup
2. For each row of Table 9, use the Yand Bbuttons to set the THM500 series
instrument to the range specified in the first column; then set the resistance
source to the resistance specified in the second column. Verify that the
THM500 series instrument readout is within the range listed in the third
column.
Table 9: Resistance accuracy test limits
Instrument range Resistance source Instrument readout
400 W100 W99.3 to 100.7
4kW1kW0.993 to 1.007
40 kW10 kW9.93 to 10.07
400 kW100 kW99.3 to 100.7
4MW1MW0.993 to 1.007
3. Disconnect the test setup.
4. If you will not be performing the Oscilloscope Verification procedures, use
the menus to return the THM500 series instrument to factory default settings
by selecting RESET ALL.
Resistance Accuracy

THM500 Series Performance Verification
Bench Test Instruments and Handheld Oscilloscopes Basic Service 15
Oscilloscope Verification
The following checks verify the performance of the oscilloscope functions. The
DMM checks begin on page 12.
NOTE. The THM575 can display the menus in more than one language. The
language selections are located in the Utility menu.
The following check verifies an acceptable noise level.
1. Set the THM500 series instrument to SCOPE mode. If necessary, press the
SELECT button to point to CH 1.
2. Use a patch cord to short the THM500 series instrument COM and CH 1
inputs as shown in Figure 4.
THM5xx
CH 1COM
Patch cord
Figure 4: Noise test setup
3. Press the SCALE button until the readout in the lower-right corner indicates
SCALE; then use the Yand Bbuttons to set the vertical scale to 10 mV/div.
4. Use the menus to set the sampling mode to SPIKE DETECT; then turn off
the menus.
5. Verify that the displayed peak-to-peak signal is less than 0.5 divisions
(5 mVp-p).
6. If your THM500 series instrument is equipped with two channels, repeat
steps 2 through 5 above for CH 2.
7. Disconnect the test setup.
Noise

THM500 Series Performance Verification
16 Bench Test Instruments and Handheld Oscilloscopes Basic Service
The following check verifies an acceptable input leakage trace shift.
1. Use the THM500 series instrument menus to set the sampling mode to
SAMPLE (NORMAL for the THM571); then turn the menus off.
2. Use a patch cord to short the COM and CH 1 inputs as shown in Figure 5.
THM5xx
CH 1COM
Patch cord
Figure 5: Trace shift test setup
3. Press the THM500 series instrument POSITION/SCALE button until the
readout in the lower-right corner shows SCALE; then use the Yand B
buttons to set the vertical scale to 5 mV/div.
4. Press the THM500 series instrument POSITION/SCALE button until the
readout in the lower-right corner shows POS; then use the Yand Bbuttons
to position the trace vertically at the center of the display.
5. Verify that as you remove the shorting patch cord, the waveform does not
move more than three pixels vertically.
6. If your THM500 series instrument is equipped with two channels, repeat
steps 2 through 5 above for CH 2.
7. Disconnect the test setup.
The following check verifies the time base accuracy.
1. Connect the time mark generator marker output to the THM500 series
instrument CH 1 and COM inputs using a 50 Wtermination as shown in
Figure 6. Assure that the ground connection for each adapter connects to the
common (or ground) connector of its associated instrument.
2. If necessary, press the THM500 series instrument SELECT button to point
to CH 1.
Input Leakage Trace Shift
Time Base Accuracy

THM500 Series Performance Verification
Bench Test Instruments and Handheld Oscilloscopes Basic Service 17
THM5xx
CH 1COM
50 Wtermination
Time Mark
generator
50 Wcable
BNC to dual banana cable
Figure 6: Time base accuracy test setup
3. Set the time mark generator for 1msmarkers.
4. On the THM500 series instrument, press the POSITION/SCALE button
until the readout shows SCALE in the lower-right corner. Use the Yand B
buttons to set the vertical scale to 200 mV/div. Use the Aand "buttons to
set the time base to 1ms/div.
5. Use the THM500 series instrument menus to set CH 1 CPLG to DC; then
turn the menus off.
6. Press the THM500 series instrument CURSORS/TRIGGER button until
the readout shows TRIG in the lower-right corner; then use the Yand B
buttons to set the trigger level to one division above the bottom of the
displayed signal. Use the Aor "button to set the trigger to rising edge ( ).
7. Press the THM500 series instrument POSITION/SCALE button until the
readout shows POS in the lower-right corner; then use the Abutton to set
the trigger position to 10%.
8. Verify that the THM500 series instrument rising edge of the fifth time mark
is within one pixel of the center vertical graticule line, measured at one
division above the bottom of the displayed signal.
9. Disconnect the test setup.