Agilent Oscilloscope Probe Selection Guide
| Passive probes: most common
type of probe, rugged and economical with bandwidth generally lower than
600 MHz. There are no active components such as transistors or amplifiers
in the probe and therefore passive probes do not need to be powered. |
10070C
10073C
1165A |
1:1 20 MHz with probe ID
10:1 500 MHz with probe ID (standard with all 7000 Series scopes)
10:1 600 MHz with probe ID |
| High voltage passive probe: view
up to 30 kVDC + peak AC voltage referenced to earth ground |
10076A
N2771A |
100:1, 4 kV, 250 MHz probe with ID
1000:1, 30 kV, 50 MHz probe |
| Single-ended active probes: Differs
from the passive probes because the probe tip contains a small active amplifier
built into the probe body near the probe tip so that the probe input capacitance
can be kept very small, usually less than 2 pF. This low capacitance results
in high input impedance on high frequencies. It has the best overall combination
of resistive and capacitive loading. With such low loading, active probes
can be used on high-impedance circuits that would be seriously loaded by
passive probes. Active probe is the least intrusive of all the probes. |
1156A
1144A
1145A |
1.5 GHz AutoProbe interface
800 MHz (requires 1142A power supply)
750 MHz 2-ch (requires 1142A power supply) |
| Active differential probes: A
"differential" probe
is an active probe which has two inputs, one positive and one negative
as well as a separate ground lead and it drives a single terminated 50Ω cable
to transmit its output to one oscilloscope channel. The output signal is
proportional to the difference between the voltages appearing at the two
inputs. A differential probe is used to look at signals that are referenced
to each other instead of earth ground and to look at small signals in the
presence of large DC offsets or other common mode signals such as power
line noise. |
1130A
N2772A
1141A |
1.5 GHz InfiniiMax amplifier with AutoProbe
interface (requires one or more InfiniiMax probe head – E2675A, E2668A,
E2669A)
20 MHz, 1.2 kVDC + peak AC max (requires N2773A power supply)
200 MHz, 200 VDC + peak AC max (requires 1142A power supply) |
| Current probes sense the current flowing through
a conductor and convert it to a voltage that can be viewed and measured
on an oscilloscope. Agilent current probes use a hybrid technology that
includes a Hall effect sensor, which senses the DC current and a current
transformer, which senses the AC current. Using split core construction,
the current probe easily clips on and off of a conductor, making it unnecessary
to make an electrical connection to the circuit. Measurement bandwidths
from DC to 100 MHz are available. |
| Current Probe Characteristics |
| Model |
Probe type |
Probe Bandwidth
(-3 dB) |
Max input current |
Applications and use |
Oscilloscope compatibility |
| 1146A |
AC/DC current,
0.1 V/A (0.1 A-10 A peak) or
0.01 V/A (1-100 A peak) |
100 kHz |
100 A rms |
AC line, motors, automotive current measurement
(requires 9 V battery) |
High impedance BNC input |
| 1147A |
AC/DC current,
0.1 V/A |
50 MHz |
15 A rms continuous
50A peak non-continuous |
Motors, switching power, magnetic device current measurements |
High impedance AutoProbe input |
| N2780A |
AC/DC current,
0.01 V/A |
2 MHz |
500 A rms continuous
700 A peak
non-continuous
|
Motors, switching power supplies, line currents
(requires N2779A power supply) |
High-impedance BNC input |
| N2781A |
AC/DC current
0.01 V/A |
10 MHz |
150 A rms continuous
300 A peak
non-continuous |
Motors, switching power supplies, transformers
(requires N2779A power supply) |
High-impedance BNC input |
| N2782A |
AC/DC current,
0.1 V/A |
50 MHz |
30 A rms continuous
50 A peak
non-continuous |
Switching power supplies, amplifiers, magnetic devices
(requires N2779A power supply) |
High-impedance BNC input |
| N2783A |
AC/DC current,
0.1 V/A |
100 MHz |
30 A rms continuous
50 A peak
non-continuous |
Switching power supplies, low current measurements
(requires N2779A power supply) |
High-impedance BNC input |
InfiniiVision
Probes and Accessories (pdf, 649K) >>
8 Hints for Better
Scope Probing (pdf, 1M) >>
|
Home
Put the experts at TestEquity to work for you. For sales, rentals,
lease quotes, and product availability worldwide, give us a call!