Description
A microwave amplifier gives no gain until it gets DC bias. The Keysight 87421A power supply fills that role. It is a compact 25 W bias source for Keysight microwave system amplifiers, with a universal-input switching design and a two-meter bias cable.
Outputs at a glance
| Item | Value |
|---|---|
| Maximum output power | 25 W |
| Positive rail | +12 V at 2.0 A |
| Negative rail | -12 V at 200 mA |
| Bias cable | 2 m |
| Input | Universal-input switching supply |
Amplifiers it can bias
The partner listing names the Keysight 83006A, 83017A, 83018A, 83050A, 83051A and 87415A amplifiers. So if your RF bench already holds one of these, the 87421A is the matching source. For any other amplifier, compare its bias voltage, current and connector pinout first. A wrong rail can damage an amplifier, so never guess.
Why the long bias cable matters
At microwave frequencies, every extra length of RF cable costs signal. That is why an amplifier works best right at the test port. The two-meter lead lets you mount the amplifier there while the supply sits back on the bench or in the rack. As a result, the RF path stays short and the DC lead covers the distance.
The Keysight 87421A power supply in daily work
- Biasing a compatible system amplifier during receiver or component tests.
- Remote amplifier placement next to an analyzer port.
- Bench and rack RF systems that need a dedicated bias source.
- Lightwave converter setups that use the specified adapter.
Care tips
Turn the unit off before you plug or unplug the bias cable. Also keep the cable clear of tight bends and sharp rack edges. In addition, give the ribbed housing some air, since a switching supply sheds heat through its case.
Ordering through Lost in HCM
Lost in HCM rents and sells the 87421A and arranges service on request. SMK Vietnam lists the part but does not supply it. Tell Lost in HCM which amplifier you plan to bias, how many units you need and your project dates. Then request a quote from Lost in HCM for the Keysight 87421A power supply. You can also see more RF and microwave accessories, visit the Keysight website, or contact SMK Vietnam.
87421A FAQ
What voltages does the 87421A deliver?
It gives +12 V at up to 2.0 A and -12 V at up to 200 mA. Maximum output power is 25 W.
Can it stay away from the amplifier?
Yes. The two-meter bias cable lets the supply sit back while the amplifier stays at the test port.
Will it run a non-Keysight amplifier?
The listing names Keysight amplifiers only. For another brand, compare rails, current and pinout before you connect anything.
Reviews
There are no reviews yet.