User manual
2638A 
Users Manual 
2-6 
Warm-Up the Product 
It is recommended that the Product be warmed up before use to stabilize the 
environmentally controlled components. This will ensure the best performance to the 
specification listed in Chapter 1. Sufficient warm-up times are as follows: 
•  If the Product has been powered off for 30 minutes or more, let it warm-up for 1 hour 
or more. 
•  If the Product has been powered off for less than 30 minutes, let it warm-up for a 
minimum of two times the length of time it was powered off. For example, if Product 
has been turned off for 10 minutes, let it warm-up for 20 minutes. 
Configure the Product 
Use the Instrument Setup menu to configure the Product. To open the Instrument Setup 
menu, push 
 on the front panel. To change a setting, highlight the setting then use 
the menu softkeys shown on the display to edit the settings. 
Table 2-2 shows the menu items and selections available in the Instrument Setup menu. 
Table 2-2. Instrument Setup Menu 
Menu Item  Description  Selections Available 
Language 
Changes the display language. 
Note 
If the incorrect language is set by accident, push 
 
then push . This temporarily resets the language to 
English. 
English 
中文 
Français 
Deutsch 
Portugués 
Español 
Русский 
日本語 
한국어 
Firmware 
Shows the firmware version installed, model number, and 
serial number 
-- 
Date 
Changes the date and date format shown on the top-right 
corner of the display. This date is also used for 
timestamps in the data log. 
MM-DD-YYYY 
YYYY-MM-DD 
DD/MM/YYYY 
Time 
Changes the time and time format shown on the top-right 
corner of the display. This time is also used for 
timestamps in the data log. 
12H or 24H 
Decimal 
Format 
Changes the decimal format to show a comma or 
decimal. 
Period (0.000) or 
Comma (0,000) 
Display 
Brightness 
Changes the display brightness level.  High, Med, or Low 
Keypad Beep 
Turn on or turn off the key beep that sounds when a key 
is pushed. 
ON or OFF 










