THDP-TMDP_Instructions-077054003.pdf - 第39页
Specifications The specifications shown apply to the THDP/TMDP series probes installed on T ektronix MSO/DSO4000 oscilloscopes. When a probe is used with another oscilloscope, the oscilloscope must have an input impedanc…
Common-mode rejection
The common-mode rejection ratio (CMRR) is the specified ability of a probe to reject signals that are common to both inputs. More
precisely
, CMRR is the ratio of the differential gain to the common-mode gain. The higher the ratio, the greater the ability of probe to reject
common-mode signals.
Common mode rejection decreases as the input frequency increases. For example, if you apply a 60 Hz line voltage of 500 V
p-p
to
both input leads of the probe, the probe rejects the signal by 80 dB (typical) and the signal appears as only a 50 mV
p-p
signal on the
oscilloscope screen.
Twisting the input leads
Twisting the input leads helps to cancel noise from high-EMI environments that is induced into the input leads.
Probe Loading
When you touch your probe tip to a circuit element, you are introducing a new resistance, capacitance, and inductance into the circuit.
Frequency and impedance of the source determine how much the probe loads the circuit you are measuring. As the frequency of the
source starts to increase beyond 1 kHz, the input impedance of the probe begins to decrease.
The lower the impedance of the probe relative to that of the source, the more the probe loads the circuit under test. For a graph of
frequency versus input impedance, refer to the Specifications section. As the graph shows, the probes have virtually no loading ef
fect on
sources with relatively low impedance and low frequency.
Operating basics
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Specifications
The specifications shown apply to the THDP/TMDP series probes installed on Tektronix MSO/DSO4000 oscilloscopes. When a probe is
used with another oscilloscope, the oscilloscope must have an input impedance of 1 MΩ and a bandwidth equal to or greater than the
probe. The probe must have a warm-up period of at least 20 minutes and be in an environment that does not exceed the limits described.
See Table 5 on page 39. Specifications for the THDP/TMDP series probes fall into three categories: warranted, typical and nominal
characteristics.
Warranted specifications
Warranted characteristics describe guaranteed performance within tolerance limits or certain type-tested requirements.
Table 4: Warranted electrical specifications
Characteristics THDP0100 THDP0200 TMDP0200
Rise time (small signal, 10–90%,
+20 °C to +30 °C). Output may be
slew rate limited for large amplitude
signals.
600 V: ≤3.6 ns(typical:
≤3.5 ns)
150 V: ≤2.4 ns(typical: ≤2.2 ns) 75 V: ≤2.4 ns(typical: ≤2.2 ns)
6000 V: ≤3.6 ns(typical:
≤3.5 ns)
1500 V: ≤2.0 ns(typical:
≤1.8 ns)
750 V: ≤2.0 ns(typical: ≤1.8 ns)
(slew rate ≥2500 V/ns
(6000 V))
(slew rate ≥650 V/ns (1500 V)) (slew rate ≥275 V/ns (750 V))
DC gain accuracy ±2% ±2% ±2%
Table 5: Warranted environmental specifications
Characteristics THDP0100 THDP0200 TMDP0200
Operating Temperature 0 °C to 40 °C (32 °F to +104 °F)
Nonoperating Temperature –30° C to +70° C (–22 °F to +158 °F)
Operating Humidity 5 to 85% RH (Relative Humidity) 0 °C to +40 °C (32 °F to +104 °F)
Nonoperating Humidity 5% to 85% RH at up to +40° C (+104 °F). 5% to 45% RH above +40° C up to +70° C (+104 to
+158 °F)
Operating Altitude 3,000 m (9,842 ft)
Nonoperating Altitude 15,240 m (50,000 ft)
Specifications
High Voltage Differential Probes THDP0100/0200 and TMDP0200 User Manual 39
Typical characteristics
T
ypical characteristics describe typical but not guaranteed performance.
Table 6: Typical electrical characteristics
Characteristics THDP0100 THDP0200 TMDP0200
Maximum measurable differential voltage.
This is the maximum measurable range of
the probe. Beyond these limits, the output
could be clipped.
600 V Range: 600 V DC +
peak AC, 450 V
rms
150 V Range: 150 V DC +
peak AC, 100 V
rms
75 V Range: 75 V DC +
peak AC, 50 V
rms
6000 V Range: 6000 V DC +
peak AC, 3000 V
rms
1500 V Range: 1500 V DC +
peak AC, 1000 V
rms
750 V Range: 750 V DC +
peak AC, 500 V
rms
Maximum common mode voltage and input
voltage-to-earth. The Common Mode ratings
are the same as the input voltage-to-earth
ratings (the maximum amount that each
input lead (+/-) can be from ground).
±6000 V DC + peak AC,
2300 V CA
T I, 1000 V CAT
III
±1500 V DC + peak AC,
1000 V CAT II, 600 V CAT
III
±750 V DC + peak AC,
550 V CAT I, 300 V CAT III
CAT I Maximum Rated Over- Voltage
Transient (OVT). Applies to CAT I ratings
only (both ranges). The OVT peak is
typically measured on top of the Peak
Working Voltage.
4600 V
pk
NA 3220 V
pk
Bandwidth (-3 dB) DC to ≥100 MHz 150 V: DC to ≥160 MHz 75 V: DC to ≥160 MHz
1500 V: DC to ≥200 MHz 750 V: DC to ≥200 MHz
Offset zero (+20 °C to +30 °C) 600 V: ±1 V 150 V: ±500 mV 75 V: ±200 mV
6000 V: ±10 V 1500 V: ±5 V 750 V: ±2 V
Input resistance between inputs 40 MΩ ±2% 10 MΩ ±2% 5 MΩ ±2%
Input resistance between each input and
ground
20 MΩ ±2% 5 MΩ ±2% 2.5 MΩ ±2%
Input capacitance between inputs <2.5 pF <2.0 pF <2.0 pF
Input capacitance between each input and
ground
<5.0 pF per side <4.0 pF per side <4.0 pF per side
Common Mode Rejection Ratio (20–30°C) DC: >80 dB DC: >80 dB DC: >80 dB
100 kHz: >60 dB 100 kHz: >60 dB 100 kHz: >60 dB
3.2 MHz: >30 dB 3.2 MHz: >30 dB 3.2 MHz: >30 dB
100 MHz: >26 dB 100 MHz: >26 dB 100 MHz: >26 dB
Propagation delay 16 ns 14 ns 14 ns
DC offset drift (output referred) 50 μV/ °C 50 μV/ °C 50 μV/ °C
Bandwidth limit filters 5 MHz 5 MHz 5 MHz
Input overdrive recovery 600 V: <30 ns to 10% of final
value after 5X overdrive
150 V: <20 ns to 10% of final
value after 5X overdrive
75 V: <20 ns to 10% of final
value after 5X overdrive
Input referred noise (mV
rms
) 600 V: <175 mV 150 V: <50 mV 75 V: <25 mV
6000 V: <400 mV 1500 V: <140 mV 750 V: <65 mV
Specifications
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