User manual

2638A
Users Manual
1-4
Table 1-1. Front-Panel Features (cont.)
Item Name Function

Function Softkeys
Function softkeys to open submenus and set selections. The function of
the softkey changes with each menu and is shown above the softkey
on the display.

Arrow Keys
Scroll menus, increase or decrease values, and highlight selections.
The keys also let the user cycle through measurement values in data
menus and also change the view of graphs.

USB Data Transfer
Indicator
Red LED that illuminates when the USB drive is recognized and flashes
red when data is transferred to or from the USB drive.
WCaution
To prevent data loss, do not remove the USB drive when
the LED is flashing.

Front-Panel USB Port
USB port to insert a USB drive.

Current Input Terminal
Input terminal to make current measurements up to 100 mA. The
current input is connected to a thermal over-current protection circuit
that disconnects the input when an overcurrent occurs and reconnects
the input when the condition is removed.

V, Ω, mA Input
Terminals
Input terminals that connect to test leads to measure ac and dc volts,
ac and dc milliamps, hertz, and ohms.

4WΩ Sense Terminals
Sense input terminals to make 3-wire and 4-wire compensated
resistance measurements.

Channel Status
Indicator
Square green box that shows when a channel is set to ON. When a
channel is set to ON, it is referred to as “active”.
 Menu Name Name of the menu.

X Hazardous Voltage
Indicator
Warns the user of hazardous voltage on an input. Shows when voltage
is >30 V dc or ac rms.
 Date and Time
Shows the current date and time that is set in the Instrument Setup
menu. This date and time is used for timestamps when data is logged.
 Module Indicator
Visually shows how many and which slots the Input Modules are
connected to. See “Input Module and Relay Card Installation” in
Chapter 2. The model 2638A/05 will only indicate one active slot.
 Scan/Monitor
Scan all active channels. The Scan function samples all active
channels directed by the test setup file. The Monitor function shows
measurement data of a single channel. See Chapter 4 for more
information and operation instructions.