Tektronix TPS2000B Series, Service Manual

Page: 18 / 92

Speci fi cations
Table 2: Time base system (cont.)
Characteristic Description
2.5 ns/div to 10 ns/div: (-4 div× s/div) to 20 ms
25 ns/div to 100 ms/div: (-4 div × s/div) to 50 ms
250
μ s/div to 10 s/div: (-4 div × s/div) to 50 s
Position Range
25 s/div to 50 s/div: (-4 div× s/div) to 250 s
Conditions Accuracy
Single-shot, sample mode ±(1 sample in 100 ppm × |reading|
+ 0.6 ns)
>16 averages ±(1 sample in 100 ppm × |reading|
+ 0.4 ns)
Delta Time Measurement Accuracy
(Full Bandwidth)
The limits apply for signals having amplitude > 5 divisions, slew rate at the measurement
points of > 2.0 divisions/ns, and acquired > 10 mV/Div.
Sample interval is the time between the samples in the waveform record.
Triggering System
Table 3: Triggering system
Characteristic Description
Holdoff Range
500 ns to 10 s
The ability to set large values of Holdoff is limited by the dif
fi culty in adjusting the Holdoff
at Sec/Div settings less than 100 ms/div. This is because Holdoff cannot be set in Scan
Mode, which begins at 100 ms/div when Trigger Mode is AUTO. By adjusting Trigger Mode
to NORMAL, the Scan Mode operation is turned off, and Holdoff can be adjusted at larger
Sec/Div settings.
External Trigger Input Impedance 1 M ±2% in parallel with 20 pF ±3 pF
External Trigger Maximum Input
Voltage 300 V
RMS
CAT 1 and CAT II
150 V
RMS
CAT III
At front panel connector, signal input to BNC shell, 300 V
RMS
; derate at 20 dB/decade above
100 kHz to 13 V peak AC at 3 MHz and above.
Based upon sinusoidal or DC input signal. For nonsinusoidal waveforms, peak value must be
less than 420 V. Excursion above 300 V should be less than 100 ms duration. RMS signal level
must be limited to 300 V. If these values are exceeded, damage to the instrument may result.
Input is rated 300 V CAT II, signal to
fl oating common.
External Trigger Maximum Float
Voltage Rated 600 V CAT II.
Instrument chassis is normally considered to be at earth ground.
Between instrument chassis and BNC shell
4 TPS2000B Series Digital Storage Oscilloscopes Service Manual