[R-390] HP400e

[John Kolb]

On Sat, 3 Aug 2002, Tanker wrote:

> Anyone familiar with this piece of gear and how it copares with a 410( )
> series Tnx

Entirely different animals - the 400 series are AC only voltmeters,
for measuring AC signals from 1 millivolt to 300 volts FS (full
scale), from low freqs up to about 10 MHz.

The 410 series is more closely related to the classic VTVM's (vaccum
tube voltmeter) from RCA, Heath, EICO, etc. It measures DC voltage
and current, AC volts, and resistance. AC voltage is measured with
a large probe, with sensitivity of 0.5V FS to 300V FS. 2% accuracy
from 100 Hz to 50 MHz, 4% from 50 to 100 MHz and 1.5 db from 100
to 700 MHz. [from the 410C manual]. There's also a useful AC probe
adapter that converts it from a 1/2" spike tip to a shielded
pair of "N" connectors for placing in a transmission line.

So to measure audio signals, get a 400. To measure transmitter
output voltage (and calculate power into a dummy load), get
a 410.

John