do 100 steps

git-svn-id: https://bucket.mit.edu/svn/nilm/zoom@7622 ddd99763-3ecb-0310-9145-efcb8ce7c51f

pc/calibrate.c

@@ -123,7 +123,7 @@ void calibrate(int zoom, int gpib)
 	if (zoom_zero_stop(zoom) < 0) goto fail;
 
 	info("Sweeping\n");
-	for (idesired = -1.0; idesired <= 1.0 && !g_quit; idesired += 0.05) {
+	for (idesired = -1.0; idesired <= 1.0 && !g_quit; idesired += 0.02) {
 		info("Zeroing\n");
 		if (zoom_zero_start(zoom) < 0) goto fail;
 		
@@ -163,12 +163,12 @@ void startup_zero(int zoom)
 	char buf[128];
 
 	if (zoom_init(zoom) < 0)
-		errx(1, "init");
+		errx(1, "init failed");
 
 	while (!g_quit) {
 		buf[0] = '0';
 		if (safewrite(zoom, buf, 1) != 1)
-			errx(1, "write");
+			errx(1, "write failed");
 		if (fdgets(buf, 128, zoom, 1000) == NULL)
 			errx(1, "read timeout");
 		chomp(buf);