Memory Card Operations
Inserting and Removing the Memory Card
3
3-5

Memory Card Battery

A typical SRAM is powered by an internal lithium 3-volt battery that has a minimum life
of five years for a 256K-byte card, and two years for a 1M-byte card. If the battery
voltage falls below 2.75 volts, the front panel BATT indicator will light (see Figure 1-1).
Battery life is reduced in applications with high ambient temperature.
Inserting and Removing the Memory Card
Memory card operations that involve inserting and removing the card are described
below. Any illegal memory card operations result in an instrument double "beep" and an
error message. Error messages are summarized in Table 3-1.

Inserting a Memory Card

To insert the memory card into the instrument, orient the card so the insertion-direction
arrows are on top and point towards the card reader slot. Push the card at the center of
the edge into the slot until resistance is noted, then firmly push until seated in the
connector. If the instrument responds with a double beep and error message, the inserted
card is unformatted (see the initialization procedure in Figure 3-3).

Removing a Memory Card

To remove the memory card from the instrument, press the ejection button to the right of
the card (see Figure 1-1). The button should be pressed firmly until it becomes flush with
the instrument front panel. This action ejects the card from the connector and pushes it
free of the reader assembly. Grasp the card and remove from the instrument.

Changing the Memory Card During Scanning

When recording measurement data to a memory card that is nearly full (as noted by the
percent indication), remove the memory card in the normal way when the BUSY
indicator is off. Then insert a new memory card (be sure it is formatted), which will
automatically open a file with the same number and continue recording data. For
example, if scanning started with dAt17 on the original card, dAt17 will be opened on
the replacement card. If the same filed already exists on the replacement card, e.g.,
dAt17, an error message appears. No data is lost during this operation as the instrument
stores up to 75 scans when the memory card is removed during scanning, and the new
memory card is immediately updated with this stored data. The PC software "Logger"
allows separate memory card files to be combined into a single file.

Setting the Memory Card Write-protect Feature

The memory card (Figure 3-1) has a write-protect switch that can be positioned to
prevent the writing of data to the card, the erasing of any dAtxx or SEtxx file, or the
initialization of the memory card. Normally, this switch is placed in the read/write
position. However, if the card has critical data that should be protected, the switch is
placed in the write-protect (read only) position.
Installing or Replacing the Memory Card Battery
To install or replace the battery in the memory card, follow the instructions supplied
with the memory card. A typical battery installation is shown in Figure 3-1. Memory
card batteries are readily available from supply houses serving the computer industry
(typically 3V dc, Panasonic BR2325, Maxell CR2025, or equal).